The study enrolled 150 patients with chronic non-cancer pain, all attending the pain clinic of a tertiary military hospital. Researchers divided participants into two groups based on their self-reported pain intensity on the widely used Numerical Rating Scale, or NRS. Patients scoring 5 or below were classified as having mild-to-moderate pain, while those scoring above 5 fell into the severe pain category. This simple cutoff allowed the team to compare psychological outcomes across a clinically meaningful threshold, since a score above 5 on the eleven-point scale is generally considered the point at which pain begins to interfere substantially with daily functioning.

To assess mental health, the investigators used two of the most established clinician-rated instruments in psychiatry: the Hamilton Anxiety Rating Scale, known as HAM-A, and the Hamilton Depression Rating Scale, in its seventeen-item version, HAM-D-17. Clinically significant anxiety was defined as a HAM-A score of 14 or higher, while clinically significant depressive symptoms were defined as a HAM-D-17 score of 17 or higher. Patients meeting either threshold were counted as having clinically significant anxiety and/or depressive symptoms. Quality of life was measured with the Short Form-36 Health Survey, a generic instrument that captures physical, social, and emotional dimensions of wellbeing.

The differences between the two pain groups were striking. Patients with severe pain had a mean anxiety score of 19.2, compared with 9.8 in the mild-to-moderate group, a difference that was highly statistically significant. Depression scores followed the same pattern, averaging 21.3 in the severe pain group versus 11.5 among those with milder pain. Both comparisons yielded P values below 0.001, indicating that the likelihood of seeing such large gaps by chance alone is vanishingly small. In practical terms, the average severe pain patient scored well above the clinical thresholds for both conditions, while the average mild-to-moderate patient scored well below them.

Those score differences translated into a dramatic gap in the proportion of patients crossing the clinical line. Fully 80 percent of patients with severe pain met criteria for clinically significant anxiety and/or depressive symptoms, compared with just 35.7 percent of those with mild-to-moderate pain, again a difference with a P value below 0.001. Quality of life told a matching story: the severe pain group averaged 48.2 on the Short Form-36, against 68.4 for the milder pain group. Taken together, the data sketch a picture in which pain intensity, psychological distress, and life quality move together in a tightly coupled system.

To determine whether severe pain was independently associated with psychological symptom burden, the researchers turned to binary logistic regression, a statistical technique that estimates the odds of an outcome while adjusting for other contributing factors. In multivariable models that accounted for severe pain, age of 50 years or older, pain duration of 12 months or longer, sleep disturbance, sex, and marital status, several factors emerged as significant. Severe pain itself carried an adjusted odds ratio of 7.89, meaning that patients with severe pain had nearly eight times the odds of clinically significant anxiety and/or depressive symptoms compared with those whose pain was milder, with a P value below 0.001.

The other independent contributors were more modest but still meaningful. Patients aged 50 or older had 2.20 times the adjusted odds of significant symptoms, a finding that reached statistical significance at P equal to 0.048. Pain that had persisted for 12 months or longer was associated with an adjusted odds ratio of 2.41, significant at P equal to 0.029. Sleep disturbance, a complaint that is nearly ubiquitous in chronic pain populations, independently raised the odds by a factor of 3.15, with a P value of 0.005. The fact that sleep disturbance remained significant after adjustment suggests that disrupted sleep is not merely a byproduct of pain intensity but a distinct thread in the web linking physical suffering to emotional collapse.

The biological plausibility of these connections is well supported by prior research. Chronic pain, anxiety, depression, and sleep disruption share overlapping neural circuitry, including limbic regions that govern emotion and descending pathways that modulate pain perception. Persistent nociceptive input can sensitize central pain pathways, while sleep loss amplifies pain sensitivity and impairs emotional regulation, creating a self-reinforcing loop in which each factor worsens the others. The new study does not untangle the direction of these relationships, but its adjusted odds ratios quantify how strongly the components of this loop cluster together in a real-world clinical population.

The authors are careful about the limits of their design. Because the study is cross-sectional, capturing a single snapshot in time, causal inferences cannot be drawn; it is impossible to say whether severe pain drives anxiety and depression, whether psychological distress amplifies pain perception, or whether both arise from shared underlying mechanisms. In addition, the researchers relied on symptom severity scales rather than structured diagnostic interviews, so formal psychiatric diagnoses cannot be confirmed. The military hospital setting also means the findings describe a specific patient population, and generalization to other contexts should be made cautiously. These caveats do not diminish the clinical signal, but they frame it as association rather than causation.

Even so, the practical implications are clear. The authors conclude that routine screening for anxiety and depressive symptoms is essential for older patients with prolonged, severe pain, so that integrated management addressing both physical and psychological dimensions of suffering can begin early. With roughly four in five severe pain patients in this cohort showing clinically significant psychological symptom burden, treating pain alone may leave the most disabling part of the illness untouched. For pain clinics, the message is that a Numerical Rating Scale score above 5 should trigger not just an analgesic review but a mental health assessment, and that asking about sleep may be one of the simplest and most informative questions a clinician can pose.

Subject of Research: The association between severe chronic pain, anxiety and depressive symptoms, and sleep disturbance in Pakistani patients

Article Title: Severe chronic pain is associated with higher anxiety and depressive symptom burden and sleep disturbance in Pakistani patients

Article References: Jalal, O., Jaffar, S., Kundi, F. K., Khaliq, S., Mufti, A. A., Chaudhry, Z. A., Ahmad, S. I., Khan, S., Anees, S., & Dalil, L. (2026). Severe chronic pain is associated with higher anxiety and depressive symptom burden and sleep disturbance in Pakistani patients. Discover Psychology. https://doi.org/10.1007/s44202-026-00882-6

Image Credits: AI Generated

DOI: 10.1007/s44202-026-00882-6

Keywords: chronic pain, anxiety, depression, sleep disturbance, quality of life, pain severity, Hamilton rating scales, military population, Pakistan, cross-sectional study, mental health screening, pain clinic