Urticaria is a common and frequent skin disease with rapid onset and frequent itching, which affects the normal life of patients. At the same time, there are many causes of urticaria, so patients must find the right cause before treatment in order to target the medicine and relieve and treat the disease in the shortest possible time. How is hives caused? The causes of urticaria are complex and can be caused by a variety of endogenous or exogenous factors. The most common ones are fish and shrimp, seafood, milk, beef and mutton, crabs, eggs, soy products, etc. Some insect foods (such as silkworm pupae, golden cicada, bullfrogs) are also common causative factors, and alcohol consumption is also a common cause of hives. 2, inhalants External inhalants may lead to the occurrence of urticaria, such as various pollen, dust mites, cotton wool, animal fur, chemical gases, etc. 3.Some diseases Some diseases can also lead to the occurrence of urticaria, such as various cancers, lymphoma, rheumatism, SLE, cholecystitis, nephritis, liver disease, gastrointestinal diseases, diabetes, chronic pharyngitis, dental caries, etc. 4, physical and chemical factors such as hot and cold stimulation, sunlight, friction and pressure and other physical and mechanical stimulation or certain chemical substances into the body and the onset of disease. 5, drug factors Many drugs can cause the disease, the most common are penicillin, cephalosporins, antipyretic and analgesic, flavopiridol, dysentery, sulfonamides, as well as serum preparations and certain vaccines. 6, certain diseases Certain diseases can also lead to the occurrence of urticaria, such as various cancers, lymphoma, rheumatism, SLE, cholecystitis, nephritis, liver disease, gastrointestinal diseases, diabetes, chronic laryngitis, dental caries, etc. Warm reminder: urticaria is not a simple skin disease, there are many kinds of phenomena, the cause of the attack and its complex and variable, the disease is prone to recurring attacks, and persistently, to the patient’s work life and learning aspects have caused great impact. There are many disadvantages of using hormonal drugs to treat hives, so avoid them! Long-term or high-dose topical use of corticosteroids can lead to addiction and drug dependence, most commonly when the condition improves after using the medication, and once the medication is discontinued, the primary lesion at the site of use worsens. When the hormone is used again, the above condition improves or disappears; if the drug is stopped again, the rebound reoccurs and is more serious than before.