Urticaria is not caused by low immunity, urticaria may be caused by autoimmune dysfunction, food factors, infections, drug factors, skin contacts or respiratory inhalants, physical factors, mental factors and so on. Urticaria is generally not caused by low immunity, patients with urticaria consider with rheumatoid arthritis, autoimmune thyroiditis, rheumatic fever, systemic lupus erythematosus and other autoimmune dysfunction. In addition, patients eating fish, shrimp, crab and other animal proteins, mango, pineapple and other fruits, or rotten food, food with added sulfites may cause urticaria. In addition, patients infected with pathogens such as Coxsackie virus, Staphylococcus aureus, Helicobacter pylori, and parasites may also cause urticaria. In addition to this, patients with furazolidone, penicillin, serum preparations, and sulfonamides may cause pharmacologic urticaria. Some patients’ skin contact with animal hair, or irritation by poisonous caterpillars or insect bites also tend to cause urticaria. Patients with urticaria may also be caused by inhaling animal dander, pollen, dust mites, dust. Also, hives can be caused by the patient’s prolonged exposure to sunlight, stress, mood swings, and depression. Urticaria is usually not caused by low immunity. It is recommended that patients who develop urticaria need to consult a doctor in time, and they can choose the appropriate measures for treatment under the guidance of the doctor.