In medico-legal practice, this relationship is often misunderstood. Claimants may fear that psychology means they are not believed. Defendants may use psychological factors to minimise the claim. Experts may avoid the issue or rely on vague phrases.
The question is not whether the pain is real. It is why it persists, what maintains it and how it affects function.
Pain and distress travel together.
Chronic pain affects sleep, mood, concentration, movement, relationships, work and confidence. A claimant who sustained a neck, back or limb injury may later describe fatigue, irritability, fear of movement, social withdrawal and loss of motivation. That does not make the pain imaginary or purely psychiatric. It means the pain has psychological consequences.
The reverse is also true. Anxiety, depression, trauma symptoms and stress can increase pain, reduce tolerance and slow recovery. Poor sleep may worsen pain. Fear of movement may lead to avoidance and deconditioning. Loss of work or independence may cause depression, reducing activity further, this is a clinical pattern and not a moral failing.
Terms such as “psychological overlay” should be used cautiously. They can suggest that the claimant has added something artificial. Distress may be a predictable consequence of persistent pain. The expert should describe the relationship clearly rather than hide behind shorthand.
The claimant’s fear.
People with chronic pain often feel they have spent months trying to be believed. They may have normal scans, limited examination findings or reassurance that no serious pathology has been identified. By the time psychological symptoms are raised, they may hear an accusation. The report should make clear that psychological factors influencing pain does not mean the pain is fabricated, exaggerated or unsupported by injury.
A claimant may sustain a soft tissue injury in an accident. The tissue injury may improve, but pain may become associated with poor sleep, fear of movement, reduced activity and low mood. Ongoing symptoms may no longer be explained by tissue damage alone, but they still require medical analysis.
Why psychological distress matters to causation.
Defendants often focus on psychological distress because it complicates causation. If the claimant had anxiety, depression, previous trauma or longstanding stress before the accident, it may be argued that later symptoms were not caused by the index event. A pre-accident history is not a complete answer.
The question is what changed, was the claimant working and functioning before the accident? Were symptoms stable or active? Did the accident produce a measurable deterioration? Did pain lead to reduced mobility, loss of work and then distress? Or were psychological symptoms already likely to cause similar difficulties?
The same issue arises when pain continues beyond expected physical recovery. Saying symptoms are “psychological” does not resolve causation. They may be secondary to accident-related pain, reflect pre-existing vulnerability, arise independently or result from several interacting factors. The report must explain which explanation is most likely.
Chronology does the hard work.
The expert should begin before the accident. What was the claimant’s pain and mental health history? Were there previous injuries, medication, counselling, sickness absence or restrictions? Were symptoms active, stable or historic? The early records should then be examined. Was pain documented? When did sleep disturbance, anxiety, low mood or avoidance appear? Did the claimant attempt to return to work? Did treatment help? Did the records show improvement, deterioration or inconsistency?
The current position must then be assessed. What is the level of pain and function? Are pain and distress reinforcing one another? Is the claimant fearful, depressed or avoidant? Are there genuine inconsistencies, or simply a complex presentation?GP records, physiotherapy notes, pain clinic letters, occupational health reports and employment evidence may all assist. A report that ignores chronology will usually produce a weak opinion.
Function is more useful than argument.
Pain scores alone are limited. What matters more is what the claimant can and cannot do. Can they work, drive, shop, sit through a meeting, walk, sleep, care for children, exercise or maintain social contact? Distress often becomes visible through these changes. A claimant may avoid movement through fear, stop travelling after an accident or withdraw socially because pain is unpredictable. Personal injury litigation is concerned with loss, not diagnosis alone.
Reported limitations must still be tested. If severe restriction is described but records show regular work, travel or exercise, the discrepancy should be addressed. It may reflect pacing, fluctuating symptoms or incomplete records. It does not automatically prove exaggeration, but it cannot be ignored.
Experts must stay within their expertise.
Chronic pain and psychological distress may require more than one discipline. An orthopaedic expert may address the original injury and expected tissue recovery. A pain specialist may assist where symptoms persist. A psychiatrist or psychologist may be needed where anxiety, depression or trauma symptoms affect causation, prognosis or function. A physical injury expert should not dismiss psychiatric symptoms outside their expertise. A psychiatric expert should not overstate physical causation. A pain expert should not assume every psychological symptom is secondary to pain without considering the pre-accident history. A disciplined report identifies what the expert can say, what requires another opinion and where uncertainty remains.
Treatment and prognosis.
A claimant whose pain is maintained by fear, low mood and poor sleep may not improve through passive physical treatment alone. Treatment may require education, graded activity, psychological therapy, pain management and support with return to function.
Untreated distress may delay recovery. Appropriate treatment may improve function even if pain does not disappear. Significant pre-existing psychiatric difficulties may make prognosis more guarded, a report should explain what is likely to help, what may limit recovery and how much future difficulty remains accident related.
The real point.
Chronic pain and psychological distress are not rival explanations. They often form part of the same clinical picture. A claimant can have genuine pain, genuine distress and pre-existing vulnerability. They can be impaired while also presenting inconsistencies. They may need psychiatric input without their pain being dismissed as imaginary.
The expert’s role is to establish the baseline, analyse the sequence of change, separate physical injury from psychological consequence where possible and explain uncertainty where it remains. Pain changes mood. Distress changes pain. The medico-legal question is what caused what, for how long and with what consequence, that is difficult work, which is precisely why it should not be reduced to a phrase.
