I have recently started breaking out in hives after/during my run. I generally run around 5 km. This happens whether I run on the treadmill or outside. I have not changed detergents, don't use fabric softener, haven't changed moisturizer or bodywash etc.. and haven't made changes to my diet. The welts are often worse on my trunk. Today I even broke out on the tops of my hands. Has this happened to anyone? Anyone have any suggestions?
I've seen a post about this kind of thing recently but couldn't find it. I did a search and found a few that might help. You can use the "Search Coolrunning Community" link at the top of the page to look at more posts.
Another poster 4mamasboys thought it might be due to untreated hyperthyroidism.