WELLNESS
Why <a href="https://healthylife7.com/inside-amy-slatons-weight-loss-journey/" title="Inside Amy Slaton’s Weight Loss Journey”>weight loss drugs might cause ‘slimmer’s palsy’
Adam Cohen and Dr. Hal Scofield
Guest columnists
Sept. 1, 2026, 6:00 a.m. CT
Adam’s Journal
I’ve heard reports that the use of drugs like Mounjaro, Ozempic and Wegovy can cause knee pain. Is this true? And, if so, what’s going on? I thought losing weight would be good for a person’s knees
Dr. Scofield Prescribes
Yes, those reports are true. But the problem isn’t actually the knee joint. And while so-called GLP-1 drugs appear to be triggering the problem, the medications themselves don’t seem to cause any sort of direct damage
Some people who’ve lost weight using GLP-1 drugs have developed pain and numbness around the outside of the knee. These sensations can also run down the knee to the calf, and they can coincide with weakness or inability to lift the foot, a condition known as foot drop
It turns out this isn’t a new phenomenon. Long before GLP-1 drugs, doctors saw the same condition in people who’d lost significant amounts of weight. The culprit is not the knee, calf or foot but, rather, a nerve — the peroneal nerve — that runs from the outside of the knee down the lower leg and into the foot
The nerve wraps around a bony prominence on the outside of the knee; it lies close to the surface, sheathed only by skin and a layer of fat. With rapid weight loss, that fat can disappear, leaving the nerve vulnerable
Activities that compress the nerve — think crossing the legs, kneeling or squatting — can cause pain and numbness around the outside of the knee and lower leg. Compression can also interfere with electrical signals that lift the front of the foot, resulting in foot drop
This condition even has a name: “slimmer’s palsy” or “slimmer’s paralysis.” Historically, it’s been relatively rare, most often occurring after bariatric surgery or extreme dieting. But doctors are now reporting cases associated with the rapid weight loss GLP-1 drugs can produce
As with bariatric surgery and extreme dieting, the rapid weight loss produced by GLP-1 drugs makes the nerve more vulnerable to compression
The good news is that mild compression can be reversible, especially if recognized quickly. In one reported case, the subject recovered strength and sensation by avoiding leg crossing, engaging in physical therapy and using temporary bracing
For anyone experiencing pain or numbness in the outside of the knee or lower leg following rapid weight loss, I’d recommend a visit to your healthcare provider, especially if the symptoms are persistent or spreading — and most urgently if you’re experiencing weakness lifting the ankle or toes
If peroneal nerve compression is the issue, conservative approaches like physical therapy and avoiding activities that put pressure on the nerve may be enough to resolve it. In more severe cases, surgical decompression can provide relief
Dr. Hal Scofield is a physician-scientist at the Oklahoma Medical Research Foundation, and he also serves as associate chief of staff for research at the Oklahoma City VA Medical Center. Adam Cohen is OMRF’s senior vice president and general counsel. Send your health questions to contact@omrf.org
