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The original was posted on /r/cfs by /u/wing_yen on 2025-08-10 21:33:50+00:00.

I’ve been tracking my symptoms since July and noticed a clear pattern: I feel significantly better in warmer weather and get PEM much more easily when it’s cold. Some context: My ATP levels have normalized after being low ( IHHT, supplements, pacing, and protein-rich diet might be contributing too), but I still deal with balance issues and limb stiffness. However, on warmer days, my movement speed and steadiness improve noticeably. Cold weather seems to lower my PEM threshold dramatically - activities I can handle fine in summer will crash me in winter. Has anyone else experienced this seasonal pattern? I’m wondering if it’s related to circulation, inflammation, or something else entirely.

I often heard LC folks can’t tolerate heat, but I am the opposite. In hot days I still have cold feet and can even have heat therapy without sweating much. Is it not common?