Common allergies: 

1. Chronic food allergy: usually refers to the allergic symptoms that some people are unable to digest food and absorb nutrients normally, the main allergens are eggs, milk, peanuts, seafood, gluten, etc.;

2. Hives, also known as urticaria, is a kind of skin rash with red, raised, itchy bumps. They may also burn or sting.  Often the patches of rash move around.

3. Hay fever, is a type of inflammation in the nose which occurs when the immune system overreacts to allergens in the air. Signs and symptoms include runny nose or stuffy nose, sneezing, red itching and tears in the eyes, and swelling around the eyes. Symptoms usually occur a few minutes after exposure to allergens and affect sleep, work ability and the attention of students, all of which are concentrated at a specific time of the year.