Allergic to Exercise: Gym Goer's Horrifying Discovery

A woman named Ellie Sullivan discovered she has a rare allergy to exercise, a condition suspected to be exercise-induced urticaria (EIU). This diagnosis means that even minimal physical activity can trigger alarming symptoms such as an itchy rash and significant swelling, particularly of her lips.

Sullivan, who had recently embraced a fitness transformation, first noticed a widespread red rash and tingling sensations after a brief run in January 2026. Subsequent experiences at the gym, involving the cross-trainer and strength exercises, led to more severe reactions, prompting a hospital visit.

Doctors confirmed the rare allergy but are investigating its cause. The condition now requires Sullivan to carry antihistamines and seek immediate medical attention during flare-ups. She has had to significantly alter her fitness routine, cutting out cardio and incorporating more rest to manage her heart rate.

Sullivan expressed her fear that the allergy could escalate to a life-threatening anaphylactic shock. She is now urging others to be vigilant and seek medical advice if they experience similar allergy-like symptoms after exercise, emphasizing the potential severity of such reactions.