Chronic Pain

What Is Chronic Pain?

Pain is the body's alarm system — a signal that something needs attention. Acute pain serves a protective function, alerting you to injury or illness so you can respond and heal. But when pain persists beyond the normal healing period — typically defined as lasting three months or longer — it crosses into the territory of chronic pain, a condition that affects an estimated 51 million adults in the United States according to the CDC.

51M+

Source: CDC, 2023

Chronic pain is not simply acute pain that never went away. It is a fundamentally different condition involving changes in the nervous system, brain, and body that cause pain to persist even after the original injury has healed — or in some cases, without any identifiable physical cause at all. This distinction is critical to understanding why chronic pain requires a different approach to treatment than acute injuries.

Types of Chronic Pain

Chronic pain takes many forms, each with distinct characteristics:

• Musculoskeletal pain: Chronic back pain, neck pain, joint pain, and conditions like osteoarthritis. Low back pain alone is the leading cause of disability worldwide according to the World Health Organization.
• Neuropathic pain: Pain caused by nerve damage or dysfunction, including diabetic neuropathy, sciatica, and post-surgical nerve pain. It often presents as burning, shooting, or electric-shock sensations.
• Central sensitization syndromes: Conditions like fibromyalgia, chronic fatigue syndrome, and irritable bowel syndrome where the central nervous system amplifies pain signals. These conditions are characterized by widespread pain, heightened sensitivity, and often no visible tissue damage.
• Headache disorders: Chronic migraine, tension-type headache, and cluster headache, affecting roughly 15 percent of the global population.
• Visceral pain: Chronic pelvic pain, endometriosis-related pain, and chronic abdominal pain arising from internal organs.

The Pain-Brain Connection

One of the most important advances in pain science over the past two decades is the understanding that chronic pain is a nervous system condition as much as it is a physical one. Research using functional MRI has shown that chronic pain is associated with measurable changes in brain structure and function.

Central Sensitization

In chronic pain, the nervous system undergoes a process called central sensitization, where the spinal cord and brain become increasingly responsive to pain signals. This means that stimuli that would not normally be painful — light touch, mild pressure, or even temperature changes — can trigger significant pain. The volume knob on the nervous system has been turned up, and it stays up.

Brain Changes

Neuroimaging studies have revealed that people with chronic pain show changes in several brain regions:

• The prefrontal cortex — involved in decision-making and emotional regulation — shows reduced gray matter in people with chronic pain, which may contribute to difficulty concentrating and emotional distress.
• The amygdala — the brain's threat detection center — becomes hyperactive, keeping the body in a state of heightened alertness.
• The insula — which processes body sensations — shows altered activity patterns, contributing to an amplified experience of pain.
• The default mode network — associated with self-referential thinking — shows increased connectivity with pain-processing regions, which may explain why chronic pain becomes all-consuming.

The encouraging news is that these brain changes are not permanent. Research published in the Journal of Neuroscience has demonstrated that effective pain treatment — including psychological interventions — can reverse many of these structural and functional brain changes.

Signs and Symptoms

Chronic pain affects far more than the body. Its impact reaches into every dimension of a person's life:

How Chronic Pain Affects Daily Life

Chronic pain is far more than a physical sensation. It can fundamentally alter how a person moves through the world:

• Work and productivity: Pain-related concentration difficulties, fatigue, and physical limitations can reduce work performance, lead to increased absences, or force career changes. Chronic pain is the leading cause of long-term disability in working-age adults.
• Relationships: Pain can strain relationships as social activities decrease, intimacy becomes difficult, and loved ones struggle to understand an invisible condition. Partners may oscillate between empathy and frustration, and the person in pain may feel guilty for being a burden.
• Identity and self-worth: When pain prevents you from doing the things that define who you are — working, parenting, exercising, creating — it can erode your sense of identity and purpose.
• Mental health: The relationship between chronic pain and mental health is bidirectional and profound, as explored in the next section.

Chronic Pain and Mental Health

The connection between chronic pain and mental health is one of the most well-documented relationships in medicine. Pain and psychological distress are not separate problems that happen to co-occur — they share overlapping neural pathways, neurotransmitter systems, and brain regions.

The Bidirectional Relationship

Chronic pain increases the risk of developing depression, anxiety, and other mental health conditions. At the same time, pre-existing mental health conditions increase the risk of developing chronic pain and make existing pain worse. This creates a cycle that can be difficult to break without addressing both dimensions simultaneously.

Common Co-Occurring Conditions

• Depression: An estimated 30 to 50 percent of people with chronic pain also experience clinical depression. Shared neurotransmitter pathways — particularly serotonin and norepinephrine — help explain this overlap. Depression in the context of chronic pain is not simply a reaction to being in pain; it reflects shared biological mechanisms that amplify both conditions.
• Anxiety: Pain-related anxiety includes fear of movement (kinesiophobia), health anxiety, and generalized worry about the future. Anxiety increases muscle tension and nervous system arousal, which can directly worsen pain.
• Insomnia: Up to 75 percent of chronic pain patients report significant sleep disturbances. Poor sleep lowers pain thresholds and impairs the body's ability to manage inflammation, creating a self-reinforcing cycle.
• Trauma and PTSD: Trauma — particularly childhood adversity — is a significant risk factor for developing chronic pain conditions. Research has shown that adverse childhood experiences increase the risk of fibromyalgia, chronic headache, and other pain conditions by two to fourfold. The nervous system changes caused by trauma overlap considerably with those seen in central sensitization.

What Causes Chronic Pain?

Chronic pain results from a complex interaction of biological, psychological, and social factors — a framework known as the biopsychosocial model, which is now considered the gold standard for understanding pain.

Biological Factors

• Tissue damage or disease: Injuries, surgeries, arthritis, nerve damage, autoimmune conditions, and cancer can all initiate chronic pain, though the relationship between tissue damage and pain severity is often surprisingly weak.
• Central sensitization: Changes in the spinal cord and brain that amplify pain signals and lower pain thresholds.
• Genetics: Research suggests that genetic factors account for approximately 25 to 50 percent of the variability in pain sensitivity among individuals.
• Neuroinflammation: Chronic activation of immune cells in the central nervous system (microglia) contributes to pain persistence in many conditions.

Psychological Factors

• Pain catastrophizing: The tendency to magnify the threat of pain, ruminate about it, and feel helpless in the face of it. Catastrophizing is one of the strongest psychological predictors of pain severity and disability.
• Fear-avoidance beliefs: The belief that movement and activity will cause further damage leads to avoidance, deconditioning, and paradoxically more pain.
• Trauma history: Adverse childhood experiences and adult trauma significantly increase the risk of developing chronic pain.
• Depression and anxiety: As described above, these conditions both contribute to and result from chronic pain.

Social Factors

• Social isolation: Loneliness and lack of social support worsen pain outcomes.
• Work-related factors: Job dissatisfaction, lack of autonomy, and physically demanding work contribute to pain chronicity.
• Socioeconomic status: Financial stress, limited healthcare access, and occupational hazards disproportionately affect lower-income individuals.
• Invalidation: Having pain dismissed by healthcare providers, employers, or family members increases distress and delays recovery.

Evidence-Based Treatments

Effective chronic pain treatment addresses the biological, psychological, and social dimensions of the condition. Research increasingly supports multidisciplinary approaches that combine physical and psychological interventions.

Psychological Treatments

Cognitive Behavioral Therapy for Chronic Pain (CBT-CP) is the most extensively researched psychological treatment for chronic pain, recommended by the American College of Physicians as a first-line treatment. CBT-CP helps you identify and challenge unhelpful thoughts about pain (such as catastrophizing and fear-avoidance beliefs), develop activity pacing strategies, improve sleep, and build a toolkit of coping skills. A Cochrane review found CBT to have small-to-moderate effects on pain intensity, disability, and mood — effects that are maintained over time. You can learn more in our complete guide to CBT for chronic pain.

Acceptance and Commitment Therapy (ACT) takes a different approach by helping you develop willingness to experience pain without struggling against it, while redirecting energy toward activities and values that matter to you. Rather than aiming to reduce pain directly, ACT focuses on reducing the suffering and disability that pain causes. Research published in The Journal of Pain found ACT to be as effective as CBT-CP for chronic pain, with particular benefits for psychological flexibility and quality of life. Explore how ACT is used for chronic pain or see how CBT-CP and ACT compare.

Mindfulness-Based Stress Reduction (MBSR) is an eight-week program that teaches mindfulness meditation and body awareness practices. Originally developed by Jon Kabat-Zinn specifically for chronic pain patients, MBSR has a robust evidence base showing reductions in pain intensity, pain-related distress, and disability. A landmark study published in JAMA found MBSR to be as effective as CBT for chronic low back pain.

Somatic Therapy and body-based approaches work directly with the nervous system through techniques that help regulate the body's stress response. For people whose chronic pain has a trauma component or involves significant nervous system dysregulation, somatic approaches can address the physiological patterns that maintain pain. Learn about what to expect in somatic experiencing.

Biofeedback uses electronic monitoring to give you real-time information about physiological processes such as muscle tension, heart rate, and skin temperature, then teaches you to control these processes. Biofeedback has strong evidence for tension headache, migraine, and conditions involving muscle tension. Neurofeedback, a specialized form of biofeedback targeting brainwave patterns, is being studied for chronic pain with promising early results. You can read about how biofeedback and neurofeedback compare.

Hypnotherapy uses focused attention and suggestion to alter the perception of pain. Multiple controlled trials have found hypnosis to produce significant reductions in chronic pain, with a meta-analysis in the International Journal of Clinical and Experimental Hypnosis reporting moderate-to-large effects for various pain conditions. Hypnotherapy appears to work by modulating pain-processing regions in the brain, particularly the anterior cingulate cortex.

Medical Treatments

• Medications: A stepped approach typically begins with over-the-counter analgesics and may include antidepressants (SNRIs and tricyclics, which affect pain pathways), anticonvulsants (for neuropathic pain), and topical treatments. Opioids, once widely prescribed for chronic pain, are now recommended only as a last resort due to risks of dependence and diminishing effectiveness over time.
• Physical therapy and exercise: Regular physical activity is one of the most consistently supported treatments for chronic pain. Exercise reduces pain, improves function, and reverses some of the deconditioning that results from pain-related avoidance.
• Interventional procedures: Nerve blocks, spinal cord stimulation, and targeted injections can provide relief for specific pain conditions, particularly when combined with active rehabilitation.
• Interdisciplinary pain programs: Comprehensive programs that combine physical therapy, psychological treatment, medical management, and occupational therapy have the strongest evidence for improving function and quality of life in people with chronic pain.

When to Seek Help

Consider reaching out to a mental health professional if your chronic pain:

• Is accompanied by persistent feelings of depression, hopelessness, or anxiety
• Has caused you to significantly withdraw from activities, relationships, or work
• Involves fear of movement or avoidance that is limiting your recovery
• Is associated with a history of trauma that has not been addressed
• Has not responded adequately to medical treatments alone
• Is affecting your sleep to the point of chronic exhaustion
• Is leading you to rely on alcohol, medications, or other substances to cope
• Has caused you to feel that life is not worth living

You do not need to choose between treating your pain and treating your mental health. The most effective approach addresses both simultaneously. A therapist trained in chronic pain — particularly one using CBT-CP, ACT, or MBSR — can be a valuable addition to your pain management team, not a replacement for medical care.

Frequently Asked Questions

Recommended Reading

These books are recommended by pain specialists and mental health professionals for understanding and living with chronic pain.

Recommended Books

Explain Pain

David Butler & Lorimer Moseley

A groundbreaking introduction to modern pain science that helps readers understand why they hurt and how knowledge itself can reduce pain.

The Way Out

Alan Gordon, LCSW

A practical guide based on Pain Reprocessing Therapy, backed by a landmark Boulder Back Pain Study published in JAMA Psychiatry.

Living Beyond Your Pain

JoAnne Dahl & Tobias Lundgren

An ACT-based workbook for chronic pain that focuses on building a meaningful life alongside pain.

Full Catastrophe Living

Jon Kabat-Zinn

The definitive guide to MBSR from its creator, originally developed for chronic pain patients at UMass Medical Center.

Chronic pain does not have to define your life

A therapist trained in pain management can help you reclaim function, reduce suffering, and build a life that is bigger than your pain.

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