The so-called allergic constitution generally refers to people who are prone to allergic reactions and allergic diseases. People who can have obvious allergic reactions when exposed to a small amount of allergens are called "allergic constitutions". People with "allergic constitutions" can develop various allergic reactions or allergic diseases, such as eczema, urticaria, allergic rhinitis or allergic asthma, allergic conjunctivitis, drug-induced dermatitis or exfoliative dermatitis, and food allergies. , cosmetic allergies, etc. However, an occasional hyperresponsiveness to a known factor cannot be called an "allergic constitution." Allergic disease is an immune disease, which is an imbalance of immune function in the human body. For people with allergies, when foreign substances or organisms stimulate the immune system to produce an excessive amount of immunoglobulin E (IgE), mast cells will be activated, causing them to release a substance called histamine, thus triggering allergic symptoms. Criteria for defining allergic constitution: The following characteristics are helpful in determining allergic constitution: 1. The skin suffers from eczema, often itching and pimples on the body, which may be an allergic constitution. 2. Frequently rub your eyes, pick your nostrils, have a runny nose, and sneeze. 3. The child has blue circles on his lower eyelids, and his eyebrows become red when he cries. 4. Excessive sweating, hyperactivity, night terrors, and vulnerability to colds. 5. Children will cough after strenuous activities. 6. I am reluctant to walk or go up stairs because I am prone to asthma. 7. Many have a family history of allergies: parents or other siblings have a history of allergies. 8. Auxiliary examinations: Allergen tests, lung function tests, nasal secretion tests, etc. are all helpful in diagnosing allergic constitution.