Histamine is a substance in the body that's released during an allergic reaction. It can cause allergy symptoms that affect the eyes, nose, throat, skin, digestive system, and lungs. When histamine affects the lungs, a person who has asthma may have breathing problems.
Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
© 1995-2015 The Nemours Foundation/KidsHealth. All rights reserved.