Pain
medical conditions

Pain

Explore the available health information, treatment context, and integrative evidence for Pain.

Background
  • Pain is defined as an unpleasant sensory and emotional experience associated with damage to body tissues, including organs, bones, and muscles.
  • Pain is the most common reason individuals seek medical care. Pain is often classified as acute (immediate, short-term) or chronic (long-term).
  • Approximately 30-40 million Americans annually do not experience symptom relief with use of over-the-counter (OTC) analgesics, such as acetaminophen (Tylenol®), aspirin, and ibuprofen (Advil®). Some researchers estimate that 35% of Americans experience chronic pain.
  • According to the National Institutes of Health (NIH), the annual cost of chronic pain in the United States, including healthcare expenses, lost income, and lost productivity, is estimated to be about $100 billion.
  • The four most common types of pain are lower back pain, severe headache or migraine pain, neck pain, and facial ache or pain. Back pain is the leading cause of disability in Americans under 45 years old.
  • There is no objective measurement of pain for individuals. Pain can only be reported by the individual experiencing it.
Signs and Symptoms
  • Pain can occur in many locations throughout the body. Pain can be constant or intermittent (off and on). Intensity can vary from a dull ache to searing agony. The onset may be sudden and acute, or gradual and chronic (long term), both occurring with or without apparent reason.
  • Doctors will consider whether pain is acute or chronic. Acute pain begins suddenly and usually does not last long. When severe, acute pain may cause anxiety, a rapid heartbeat, an increased breathing rate, elevated blood pressure, sweating, and dilated pupils.
  • Chronic pain persists for greater than three months. The term usually describes pain that persists for more than one month beyond the usual course of an illness or injury, pain that recurs off and on for months or years, or pain that is associated with a chronic disorder such as cancer. Usually, chronic pain does not affect the heartbeat, breathing rate, blood pressure, or pupils, but it may result in other problems, such as depression, disturbed sleep, decreased energy, loss of appetite, weight loss, and loss of interest in sexual activity.
  • Breakthrough pain: Many individuals who are being treated for chronic pain may experience a brief, often severe flare-up of pain. This flare-up is called breakthrough pain because it breaks through the regularly scheduled pain medication therapy. Typically, breakthrough pain begins suddenly, lasts up to one hour, and feels much like the individual's chronic pain except it is more severe. Breakthrough pain may differ from one individual to another and is often unpredictable. Improper pain control is the main cause of breakthrough pain.
  • Complex regional pain syndrome (CRPS): Complex regional pain syndrome (CRPS) is a chronic pain condition, with symptoms of continuous, intense pain out of proportion to the severity of the injury. CRPS usually occurs in individuals with chronic pain due to an injury. This intense pain gets worse rather than better over time. CRPS most often affects one of the arms, legs, hands, or feet. Often the pain spreads to include the entire arm or leg. Typical features include dramatic changes in the color and temperature of the skin over the affected limb or body part, accompanied by intense burning pain, skin sensitivity, sweating, and swelling.
Diagnosis
  • Medical history and physical examination: Diagnosing the underlying cause of pain can be difficult. When an individual experiences pain, a doctor may take a number of steps to assess the pain and attempt to determine its cause. Assessment of pain typically begins with a discussion of the individual's medical history and a physical examination. A medical history, which includes age, weight, current and past medical problems, medications, and height, is taken. In the discussion portion of the pain assessment, the individual may be asked to describe the pain according to: when it started; what it feels like; how bad it hurts; where it's located; and factors that improve or worsen the pain.
  • The doctor may use a pain diagram or picture of the human body to evaluate the pain. The individual will mark the area or areas where pain is felt on the chart. Doctors may also use pain scales, which help quantify the pain intensity. Individuals with pain who visit their doctor are often asked to rate their pain on a 0 to 10 scale, with 0 being "no pain" and 10 being "the worst pain imaginable." This is a valid and simple way to monitor an individual's pain. However, pain perception is very subjective and varies from one individual to the next.
  • During a physical examination, a doctor will inspect the area of pain, looking for visual signs of causes, such as trauma and injury. Depending on the location, the doctor may test joints and muscles for strength and range of motion.
  • Blood and urine tests: Blood and urine tests can help diagnose diseases that may be causing pain. They can identify abnormal amounts of hormones, enzymes, or other body chemicals that may indicate disease.
  • Computed tomography (CT) scan: Computerized tomography (CT) scan is an x-ray that uses computer technology and can be enhanced with the injection of a contrast dye into a vein. CT scans allow for multiple X-rays to be taken from different angles around the body where the pain is located to create a three-dimensional image of internal body structures. CT is used to show abnormalities in bones and soft tissue. CT scan can be used for individuals who are unable to tolerate MRI.
  • Electromyography (EMG): Electromyelography (EMG) is a test that identifies muscles and nerves affected by weakness or pain. EMG works by measuring the electrical activity generated by active muscles. A lumbar puncture (spinal tap) will be performed in order to inject contrast dye into the cerebrospinal fluid in the spine. This allows the doctor to outline the spinal cord and nerve roots, and abnormal disc conditions or bone spurs can be visualized using an x-ray or CT scan. EMG is often used along with nerve conduction studies.
  • Magnetic resonance imaging (MRI): Magnetic resonance imaging (MRI) tests use a powerful magnet to produce images on a computer screen and film. Magnetic resonance imaging (MRI) scans provide clear images of disc deterioration, pathologies of the spinal cord, spinal stenosis, herniated discs, spinal tumors, and abnormalities in nerves and ligaments. An MRI is conducted in a small, confined area, and some individuals may find this uncomfortable. Some individuals may have to be sedated using a mild sedative such as alprazolam (Xanax®) or lorazepam (Ativan®). If the individual is sedated, transportation should be organized using a family member or friend.
  • Nerve conduction studies (NCS): Nerve conduction studies (NCS) evaluate muscle or nerve damage. These tests function by measuring the speed of electrical impulses through the nerves.
  • Radioactive bone scan: Radioactive bone scans locate problems (such as a fracture or osteoporosis) in the vertebrae. A chemical called a radioactive tracer is injected into the patient and after several hours, a picture using a gamma camera (a medical imaging device) will reveal bone undergoing rapid changes where large amounts of tracer accumulate.
  • Spinal tap: Spinal taps involve drawing a sample of cerebrospinal fluid and analyzing it for elevated pressure, infection, bleeding, or tumor. Spinal taps may be painful and may require sedation.
  • X-ray: X-rays are low doses of radiation that create an image of a body part, organ, or bodily system on film paper or fluorescent screens. X-rays show the alignment of the spine and may reveal degenerative joint disease, fracture, or tumor.
Complications
  • Pain can lead to other conditions, including: fatigue, which may cause impatience and a loss of motivation; sleeplessness, often because pain does not allow the individual to receive a full night's sleep; withdrawal from activity and an increased need to rest; a weakened immune system, leading to frequent infections or illness; depression, which may cause pain to feel worse; other mood changes, such as hopelessness, fear, irritability, anxiety, and stress; loss of mobility, such as such as trouble walking up stairs, standing, or sitting; and disability, which may include not being able to go to work or school or perform other daily activities.
Treatment
  • Pain treatment or management is generally more effective from a multidisciplinary approach that includes medications (analgesics such as narcotics or non-steroidal anti-inflammatory drugs and pain modifiers such as tricyclic antidepressants or anticonvulsants), non-pharmacologic measures (such as interventional procedures, physical therapy and physical exercise, application of ice and/or heat), and psychological measures (such as biofeedback and cognitive therapy). Analgesics are medications given to reduce pain without resulting in loss of consciousness. Doctors choose an analgesic based on the type and duration of pain and on the likely benefits and risks. Most analgesics are effective for nociceptive pain but are less effective for neuropathic or nerve pain. For some types of pain, especially chronic pain, non-drug treatments are also important, including acupuncture and biofeedback.
  • Pain management practitioners include doctors who specialize in pain management, such as anesthesiologists, neurologists, and psychiatrists. Nurses, nurse practitioners, physician assistants, pharmacists, occupational therapists, and psychologists also are part of a pain management team to ensure that adequate pain control for each individual is achieved.
  • The treatment of pain depends upon the causes of the pain and the individual's tolerance of pain.
  • Medications :
  • Prescription and non-prescription medications are one of the most common methods of treating all types of pain. Doctors may use various combinations and doses of medications. With pain medications used for chronic pain, the most serious considerations are for excessive sedation, severe constipation, and under usage. If the individual is not adequately relieved of the pain, or is relieved for only a part of the day, the treatment is inadequate. Analgesics fall into three categories: opioid (narcotic) analgesics, non-opiate analgesics, and adjuvant analgesics. Adjuvant analgesics are drugs that have weak or nonexistent analgesic action when administered alone but can enhance analgesic actions when given together with known analgesic agents.
  • Non-opioid and opioid analgesics are the main drugs used to treat pain. Opiates are naturally occurring and are derived from the opium poppy (Papaver somniferum). Opioids are synthetic drugs based on the opiate chemical structure and with opiate-like activity. Opioids activate opiate receptors that are widely distributed throughout the brain and body. When the opioid reaches the opiate receptors, it can produce pain relief and also euphoria (a feeling of well-being). The brain itself also produces substances known as endorphins that activate the opiate receptors. Research indicates that endorphins are involved in many things, including respiration, nausea, vomiting, pain modulation, and hormonal regulation. When opiates are prescribed by a doctor for the treatment of pain and are taken in the prescribed dosage, they are safe and there is little chance of addiction. However, when opiates are abused and taken in excessive doses, addiction can result.
  • Antidepressants, anticonvulsants, and other CNS-active drugs may also be used as adjuvant analgesics in chronic pain or nerve pain.
  • Non-opioids: Non-opioids, such as acetaminophen (Tylenol®), aspirin, and ibuprofen (Motrin®, Advil®), are used to control mild to moderate pain. Some non-opioids can be bought over-the-counter (OTC) without a prescription. Some of these medicines can cause stomach upset, may cause bleeding in the stomach, slow blood clotting, and kidney problems. Acetaminophen does not normally cause these side effects, but high doses or long-term use of it can damage the liver.
  • Prescription non-steroidal anti-inflammatory drugs (NSAIDs), such as flurbiprofen (Ansaid®) and celexocib (Celebrex®) and muscle relaxants, such as cyclobenzaprine (Flexeril®), may also be used for pain control. Side effects of prescription NSAIDs include stomach upset and nausea.
  • Opioids: Opioid medications are used to control moderate to severe pain. Opioids include natural (opiate) and synthetic drugs, such as morphine (MS Contin®, Astromorph®), hydromorphone (Dilaudid®), hydrocodone (Vicodin®), oxycodone (Roxicodone®, OxyContin®), codeine (Tylenol #3®), fentanyl transdermal (Duragesic®), and methadone (Dolophine®). Opioids may cause constipation, drowsiness, sedation, itching, difficulty urinating, nausea, and vomiting. Opioids may also be physically addictive.
  • Opioids may be combined with other medications to increase effectiveness in treating pain. Examples include Percocet®, a combination of oxycodone and acetaminophen, and Percodan®, a combination of oxycodone and aspirin.
  • For chronic pain, sustained relief formulations of opioids are available that provide a longer duration of relief (generally up to 12 hours), such as with morphine (MS Contin®, Avinza®) and oxycodone (OxyContin®). In severe pain, fentanyl patches (Duragesic®) can be placed on the skin (topically) for longer pain control (up to 72 hours). Opioid medications are also available as suppositories for those who cannot take medications by mouth.
  • Patient-Controlled Analgesia (PCA) has become an acceptable and highly effective means of relieving post-operative pain. PCA is a medication-dispensing unit equipped with a pump attached to an intravenous line, which is inserted into a blood vessel in the individual's hand or arm. By means of a simple push button mechanism, the patient is allowed to self-administer doses of opioid medications on an "as needed" basis. There is usually a "lockout" period to prevent the individual from taking too much opiate medication. However, prior to release from the hospital, the individual is weaned from the PCA and given oral medication to control pain. Benefits of PCA include: less apprehension by the individual with pain; narcotic addiction can be avoided because the drug is taken on a short-term controlled basis; pain relief is available around the clock; there is no waiting period for a nurse to deliver pain medication; the individual is assured they are receiving the correct medication and dose prescribed by their physician; doses are smaller and available more frequently, which helps prevent sleepiness and fatigue; and pain is more consistently controlled.
  • Tramadol (Ultram®) is a prescription medication that has opiate-like activity but seems to have less addictive and abuse potential than conventional opiates, such as hydrocodone (Vicodin®) and oxycodone (Oxycontin®). Buprenophine (Buprenex®) and butorphanol (Stadol®) are also opiate-like drugs that are used for the treatment of moderate to severe pain.
  • Antidepressants: Antidepressant medications, such as amitriptyline (Elavil®), doxepin (Sinequan®), or trazodone (Desyrel®) may be used to help control tingling or burning pain from damaged nerves. These drugs may also improve sleep. However, these antidepressant medications may cause dry mouth, sleepiness, blurred vision, and constipation.
  • Anti-epileptics: Anti-epileptic (or anticonvulsant) medications, such as gabapentin (Neurontin®) or valproic acid (Depakote® or Depakene®), may help control tingling or burning from nerve injury. These medications may cause drowsiness and may damage the liver and lower the number of red and white cells in the blood. A doctor will order regular blood tests to check for these effects.
  • Corticosteroids: Corticosteroids, or steroids, may help relieve bone pain, pain caused by spinal cord and brain tumors, and pain caused by inflammation. Steroids include prednisone (Deltasone®) and dexamethasone (Decadron®). Steroids may cause fluid to build up in the body and may also cause bleeding, irritation to the stomach, increased blood sugar, muscle weakness, and may decrease immunity. Steroids also increase appetite. Confusion is a problem for some individuals while taking steroids.
  • Others: Pain relievers that are applied directly to the skin (topical analgesics) for localized pain include lidocaine patch (Lidoderm®), commonly used in shingles (nerve pain caused by a herpes virus).
  • Pain clinics: Pain clinics, or pain management centers, are facilities that help individuals deal with chronic pain. A pain clinic may be in a wing of the local hospital or medical center, in a separate medical-professional building, or in a doctor's office. Some pain clinics are affiliated with medical schools and large healthcare centers. Pain clinics have healthcare professionals trained in the field of pain management. The pain centers offer more individual care for chronic pain management, helping the individual receive the most efficient pain control for their unique situation. Pain centers also help the individual with the addictive component of opiate medications in the treatment pain.
  • Individuals with active addictive disorder or a substance abuse history are at increased risk of receiving inadequate pain management, because of a fear of increasing addiction by using opioid medications, lack of knowledge about addiction, doctor barriers including inadequate training in pain management and addiction medicine, and fear of regulatory sanctions contributing to under-treatment.
  • Other therapies :
  • Psychological treatment: Psychological factors such as mood, beliefs about pain, and coping skills have been found to play an important role in an individual's adjustment to chronic pain. When pain persists for an extended period of time, the individual may avoid doing regular activities for fear of further injury or increased pain, including work, social activities, exercise, or hobbies. As the individual withdraws and becomes less active, their muscles may become weaker, they may begin to gain or lose weight, and their overall physical conditioning may decline. This can contribute to the belief that one is disabled. As pain persists, the person may develop negative beliefs about their experience of pain, such as the feeling of never getting better. These types of thoughts can maintain the pain cycle.
  • Cognitive behavioral therapy (CBT): Cognitive behavioral therapy (CBT) is a psychological treatment that has been found to be highly effective in helping patients to reduce pain, disability, and distress. CBT for chronic pain management involves modifying negative thoughts related to pain, such as feelings or worthlessness or hopelessness. CBT also helps increase the individual's activity level and productive functioning. This approach for pain management has been shown to be highly effective in promoting positive cognitive and behavioral changes in individuals with chronic pain. Treatment can be delivered individually or in a group setting. CBT for pain management is tailored to the individual needs of the patient but may include relaxation training, cognitive restructuring (different ways of thinking about problems and stress), stress and anger management, sleep quality, and activity pacing.
  • Physical therapy and exercise: A physical therapist can apply a variety of treatments, such as heat, ice, ultrasound, electrical stimulation, and muscle release techniques, to areas where pain originates. As pain improves, the physical therapist can teach the individual specific exercises to increase flexibility, strengthen the back and abdominal muscles, and improve posture. Regular use of these techniques may help prevent pain from coming back. Exercise can correct current back problems, help prevent new ones, and relieve back pain, particularly after an injury. Proper exercise strengthens back muscles that support the spine and strengthens the abdomen, arms, and legs, reducing strain on the back. Exercise also strengthens bones and reduces the risk of falls and injuries.
Prevention
  • For prevention of acute and chronic pain, it is important to take all prescribed medications and use all therapies for pain as ordered by a doctor.
  • Proper body mechanics: Many options exist for individuals wishing to prevent back and neck pain. Learning proper body mechanics, such as bending, lifting, and twisting, is particularly important if the individual's occupation involves repetitive bending, lifting, and twisting.
  • Exercise: Regular exercise helps to keep back muscles strong and flexible. Regular low-impact aerobic activities do not strain or jolt the back and neck. Low-impact aerobic exercises may also increase strength and endurance in the back and allow the muscles to function better. Walking and swimming are good choices. Abdominal and back muscle exercises, also called core-strengthening exercises, help condition back muscles so that they function more efficiently and help protect the back from injury. Flexibility in the hips and upper legs aligns the pelvic bones to improve back comfort. A healthcare professional can help the individual choose what exercise program may be best.
  • Posture: Maintaining good posture, such as sitting straight in a chair and not slumping, can prevent and decrease back pain. Avoid standing or sitting in one place for long periods of time. Individuals with jobs that require long standing or sitting should take frequent breaks from standing or sitting positions to help prevent back pain.
  • Weight control: Maintaining weight within an ideal range for the individual's body size is very important. Excess weight has been directly linked with the development and worsening of back and knee pain. In order to compensate for extra weight, the spine can become tilted and stressed unevenly. As a result, over time, the back may lose its proper support and an unnatural curvature of the spine may develop. In particular, pain and problems in the low back may be aggravated by obesity. This occurs in individuals with extra weight in their stomachs because the excess weight pulls the pelvis forward and strains the lower back, creating lower back pain.
  • Diet: Eating a healthy diet is important. A healthy diet, including fresh fruits and vegetables, provides the body with essential nutrients for health, and can help decrease the underlying causes that lead to pain, such as poor vascular (blood vessel) and nerve health.
  • Stopping smoking: Smokers have diminished oxygen levels in their spinal tissues that can hinder the healing process. Clinical studies have been mixed over whether cigarette smoking leads to back conditions, but there is evidence that smoking may increase the risk of developing sciatica, back pain that radiates to the hip and/or leg due to pressure on a nerve.
References

Natural Standard developed the above evidence-based information based on a thorough systematic review of the available scientific articles. For comprehensive information about alternative and complementary therapies on the professional level, go to www.naturalstandard.com. Selected references are listed below.

  • American Association of Neurological Surgeons. .
  • American Chiropractic Association. .
  • American Chronic Pain Association. .
  • American Pain Foundation. .
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  • The Movement Disorder Society. .
  • National Institute of Neurological Disorders and Stroke. .
  • National Pain Foundation. .
  • Natural Standard: The Authority on Integrative Medicine. .
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  • White A, Foster NE, Cummings M, et al. Acupuncture treatment for chronic knee pain: a systematic review. Rheumatology (Oxford). 2007;46(3):384-90. View Abstract