Urticaria, commonly known as “rubella”, is a common allergic skin disease with the main manifestation of skin eruptions, accompanied by severe itching, and occurs at least once in the lifetime of about 15% to 25% of people. Chronic urticaria refers to recurrent urticaria for more than 6 weeks, mostly due to incomplete treatment of acute urticaria. There are generally no systemic symptoms, and the rash is sometimes more or less frequent, recurring, often for months or years, seriously affecting the patient’s work, study and quality of life. Some patients have a certain regularity in the timing of rash attacks, such as good before bedtime. Most patients with chronic urticaria cannot find the exact cause of the allergy, so prevention of chronic urticaria is a very difficult task. Generally speaking, chronic urticaria patients should pay attention to the following points in their daily lives: 1. Pay attention to diet. Certain foods, mainly animal proteins such as fish, shrimp, crab shells, meat, milk and eggs, plant foods such as mushrooms, strawberries, cocoa, tomatoes and garlic, as well as certain food condiments and additives, can cause allergic reactions in humans. 2, careful use of drugs. Many drugs can cause allergic reactions in humans and lead to the onset of hives. Common drugs such as penicillin, cephalosporin antibiotics, serum preparations, various vaccines, dysentery and sulfonamide. 3.Improve body resistance and prevent various infections. Such as influenza, viral upper respiratory tract infections, viral hepatitis and other viral infections. Tonsillitis, chronic otitis media, sinusitis and other bacterial infections. Foot fungus, gray nails, sweat spots and other fungal infections as well as parasitic infections such as roundworms, schistosomes, pinworms, etc. may cause hives. 4, cold wind, hot water bathing, sunlight, friction and pressure and other physical factors can cause the onset of certain patients. 5, inhalation factors such as animal fur, dander, dust mites, plant pollen, dust, etc. may cause urticaria. 6, mental tension, strenuous exercise can cause the onset of certain patients. 7, active treatment of chronic medical diseases rheumatic fever, rheumatoid arthritis, systemic lupus erythematosus, malignant tumors, metabolic disorders, endocrine disorders and other diseases can become the cause of urticaria, especially chronic urticaria. 8, the correct use of anti-allergy drugs, the time to take medication should be adjusted according to the time of occurrence of the rash, such as good before bedtime should be taken after dinner. After the rash is controlled, the medication should be continued for 2 to 3 weeks and gradually reduced; when an anti-allergic drug is not effective, 2 to 3 anti-allergic drugs can be used in combination or alternately. If necessary, Chinese medicine can be used in conjunction with the treatment.