At least with me there seems to be a link of a resurgence of symptoms when I become slightly dehydrated. Specifically it is my hands that get stiff. It is easily fixed by drinking a bunch of water and re-hydrating the system. It makes me wonder if the heat has a double negative impact on the body both from getting hot and having the symptoms come back as well as dehydrating the body which also causes the symptoms to come back. Makes it easy to tell when I need to drink more because my hands get stiff.