Research published in Pain (2003 Aug;104(3):549-557.) examined more than 1,100 adults receiving treatment for obesity and found that hip, knee, ankle, back, and neck pain were all far more common in obese individuals than in the general population. Two years after bariatric surgery, participants reported significantly lower pain levels, suggesting that weight reduction may ease mechanical stress on joints.

Obesity May Also Influence How the Brain Processes Pain

Extra weight naturally increases pressure on weight-bearing joints, but newer research indicates that obesity may also affect the nervous system’s perception of pain.

A study conducted by Ohio State University and Duke University evaluated 62 adults with knee osteoarthritis, about one-third of whom had a BMI between 30 and 35. Researchers applied a standardized electrical stimulus to a nerve in the lower leg to measure pain tolerance.

  • Individuals with obesity had substantially lower pain tolerance than those with lower BMIs.

These findings suggest that obesity may amplify pain not only through mechanical stress on the joints but also through altered pain processing in the nervous system—making discomfort feel more intense and harder to manage.

Educational only — not medical advice.