Yes, you really can be allergic to exercise, and the symptoms can be serious

Article excerpt

Exercise-induced anaphylaxis is a genuine allergic condition that can trigger severe reactions during or after physical activity. Unlike the joke that sedentary people make, this rare allergy produces real symptoms, from hives and swelling to breathing difficulties and cardiovascular collapse, that demand immediate medical attention. The condition often goes undiagnosed because people mistake the symptoms for heat exhaustion or asthma, creating a dangerous gap where sufferers don't recognize they need emergency care. Medical professionals are increasingly aware of the condition, but public understanding remains limited, leaving many at-risk individuals unaware they face a serious health threat.