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MS Heat Sensitivity - Uhthoff's Phenomenon

For those with Multiple Sclerosis (MS), heat, humidity, and cold winds can all trigger or worsen symptoms due to the nervous system’s sensitivity. Heat and humidity may cause fatigue, weakness, or blurred vision (Uhthoff’s phenomenon), as damaged nerves conduct signals less efficiently when body temperature rises. On the other hand, cold winds can cause muscle stiffness, spasms, or pain by tightening tissues and reducing blood flow. From a terrain theory view, these are not “flare-ups,” but sign