An allergy is when your body's immune system reacts to something by mistake, such as harmless food, plants, or medicine. In exercise-induced allergic reactions, the immune system reacts to physical activity, either during or after activity.
Asthma is the most common exercise-induced allergic reaction and is treated with typical asthma medicines
Becoming more fit or gradually increasing how much you exercise can prevent exercise-induced allergic reactions
Exercising can trigger:
An asthma attack, in which your chest feels tight, you cough, wheeze, and have trouble breathing—this is more likely to occur when the air is cold and dry
An anaphylactic reaction—this is rare, but hard exercise can cause a severe, life-threatening reaction in which you have difficulty breathing or your blood pressure falls, leading to dizziness and collapse
Sometimes an anaphylactic reaction is caused by eating certain foods, especially wheat or shrimp, before exercising.