Long ago, a MS heat intolerance test was performed on people suspected of having MS. Multiple Sclerosis heat intolerance was tested with a hot bath. When the patient was submerged into a bath of hot water, neurologic symptoms were observed. If the symptoms became exacerbated, then the patient was suspected of having MS. Once MRIs became available, the ‘hot bath’ test was no longer necessary.

Due to the build-up of plaque on nerve cells where the immune system has stripped the myelin sheath off, the nerve functions are slowed down. Heat actually slows down already sluggish functions even more so. For some MS patients, the rise in temperature can be as small as a quarter of a degree to aggravate symptoms.

Symptoms of Multiple Sclerosis heat sensitivity include blurred vision, tremors, fatigue, memory problems, numbness, an overall weakness, and difficulty with cognitive function. Some patients are more sensitive to a …