Chronic pain — defined as pain lasting more than three months — is one of the most common, disabling, and poorly understood health conditions in the world. It affects approximately 20% of adults in developed countries and is the leading cause of disability globally. Yet it remains widely misunderstood, often undertreated or overtreated, and deeply challenging for those who live with it.
This guide explains what we know about how chronic pain works and which approaches have the best evidence for helping people live well despite it.
Why chronic pain is different from acute pain
Acute pain serves a biological purpose — it signals tissue damage and motivates protective behaviour. When a bone heals or a wound closes, the pain resolves. Chronic pain is fundamentally different. In many cases, it persists long after any tissue damage has healed, or exists without identifiable structural cause at all.
Modern pain science has transformed our understanding. Pain is not a simple readout of tissue damage — it is a complex experience produced by the brain based on many inputs including sensory signals, context, beliefs, emotions, previous experiences, and expectations. In chronic pain, the nervous system itself becomes altered — a process called central sensitisation. The pain alarm system essentially becomes amplified and hypersensitive, producing pain signals disproportionate to any tissue injury.
This does not mean the pain is "imaginary" or "psychological." It is real, it is biological, and it is as valid as any other medical condition. But it does mean that purely tissue-focused treatments — surgery, injections, rest — are often inadequate or counterproductive for chronic pain.
What evidence shows works for chronic pain
Exercise and movement
Counterintuitively for people in pain, movement is among the most effective treatments for most chronic pain conditions. Rest and avoidance of activity — while understandable — tend to worsen chronic pain through deconditioning, increased sensitivity, and reduced function. Exercise improves pain through multiple mechanisms: reducing inflammation, releasing endorphins, improving sleep, reducing anxiety, and gradually recalibrating the sensitised pain system.
The type of exercise varies by condition — gentle aerobic exercise and graded activity are the foundation for most conditions, with targeted physiotherapy for specific musculoskeletal conditions.
Cognitive behavioural therapy (CBT)
Psychological approaches to pain are among the most evidence-based treatments available. CBT for chronic pain helps people identify and change unhelpful thought patterns and behaviours (catastrophising, fear-avoidance) that amplify pain and disability. It does not treat pain as a psychological problem — it recognises that thoughts, emotions, and behaviours directly influence pain processing in the nervous system.
Acceptance and Commitment Therapy (ACT) — helping people live meaningfully despite pain rather than fighting it — also has strong evidence, particularly for long-term wellbeing.
Pain education
Understanding how pain works — particularly understanding central sensitisation and the role of the brain in pain — consistently reduces pain intensity and disability in clinical trials. This is not about telling people pain is not real; it is about changing the understanding of what pain means, which directly changes how the nervous system processes it.
Sleep management
Poor sleep and pain are bidirectionally related — each worsens the other. Treating sleep problems (via CBT for insomnia) is one of the most underutilised interventions in chronic pain management.
Medications: realistic expectations
Paracetamol (acetaminophen) — evidence for chronic pain is surprisingly weak. It remains useful for episodic acute pain but provides little benefit for most chronic pain conditions. However, it is safe in appropriate doses and may provide modest relief for some.
NSAIDs (ibuprofen, naproxen) — more effective than paracetamol for inflammatory pain conditions. Appropriate for short-term use but carry gastrointestinal, cardiovascular, and kidney risks with long-term use.
Antidepressants — tricyclic antidepressants (amitriptyline) and SNRIs (duloxetine) have genuine analgesic effects independent of their antidepressant effects, particularly for nerve pain and fibromyalgia. Often used at lower doses than for depression.
Anticonvulsants (gabapentin, pregabalin) — effective for neuropathic (nerve) pain. Have significant side effects and abuse potential; use is becoming more restricted in many countries.
Opioids — for chronic non-cancer pain, the evidence is poor and risks are substantial. Long-term opioid use often leads to tolerance (reduced effectiveness), hyperalgesia (paradoxically increased pain), physical dependence, and addiction. Guidelines increasingly recommend against opioids as first-line treatment for chronic non-cancer pain.
Procedures and interventions
For specific conditions, procedural interventions may be helpful: nerve blocks, spinal cord stimulation, joint injections, and surgery in carefully selected patients. However, for non-specific chronic pain, procedural interventions have poor evidence and carry their own risks. The decision to proceed with any invasive intervention should involve careful consideration of evidence, individual factors, and shared decision-making with a specialist.
Multidisciplinary pain programmes
The most effective approach to complex chronic pain is multidisciplinary — combining physiotherapy, psychology, occupational therapy, and medical management in a coordinated programme. These programmes focus on improving function and quality of life rather than eliminating pain, and have the strongest evidence for long-term improvement in disability and wellbeing.
Living well with chronic pain
Chronic pain research consistently shows that acceptance — not resignation, but a genuine willingness to live fully despite pain — is associated with better quality of life than fighting pain constantly. Focusing on function (what you can do, not just pain intensity), maintaining social connections, setting meaningful goals, and working with healthcare providers on realistic treatment targets are all associated with better outcomes than pursuing pain elimination as the only goal.
If you are living with chronic pain, you deserve appropriate, multidisciplinary care. Advocate for a referral to a pain clinic or multidisciplinary pain management programme if you have not already received one.
Editorial note: This article was written by the SymptomSense editorial team in accordance with our editorial policy. It is reviewed against NHS, WHO, and Mayo Clinic guidelines and updated regularly. Last reviewed June 2026. This article is for informational purposes only and does not constitute medical advice.