Urticaria is commonly known as pancytopenia. It is an allergic disease. The disease is divided into two types: acute and chronic. Usually the rash that recurs for more than eight weeks is called chronic. The cause of its development is very complex. Most patients cannot find the cause. This is especially true for some chronic urticaria. It may be related to food, food additives, drugs, pollen, animal fur, fungal spores, dust. There are also bacterial or viral infections, fungal infections. Insect bites, physical factors, psychological factors, endocrine factors, etc. Its clinical manifestations. Itching of the skin and the appearance of red wind masses. They can protrude from the skin and usually subside within 24 hours, with recurrent attacks. In severe cases it can accumulate in the digestive tract. Symptoms such as nausea, vomiting and abdominal pain occur. It can also accumulate together with the respiratory tract. Shortness of breath and panic in the chest may occur. In severe cases, there is even laryngeal edema and suffocation. There are also some specific types of urticaria. For example, cholinergic urticaria heliotropic urticaria, pressure urticaria. Cutaneous urticaria. Angioedema. And so on. His diagnosis should be very easy, based on the clinical presentation. Treatment is usually symptomatic and supportive. There are hormones, and anti-allergy drugs available. The patient must be cooperative in the treatment of urticaria. Especially chronic urticaria. Do not interrupt the medication when you see results. This can lead to relapses. In daily life, it is important to live a regular life. Exercise to improve your immune system. Try not to eat irritating foods. For example, some fish, shrimp, mutton, etc.