Urticaria, commonly known as “rubella”, is a confined edema of the skin and mucous membranes due to a temporary increase in vascular permeability, i.e., hives. There are many causes of urticaria, and some diseases are easily accompanied by urticaria, so urticaria is not necessarily the body is too bad. Common causes of urticaria include food (animal proteins, plants, food additives, etc.), infections (hepatitis viruses, coxsackie viruses, streptococci, fungi, parasites, etc.), medications (penicillin antibiotics, serum preparations, various vaccines, etc.), respiratory tract inhalants and skin contacts (pollen, animal dander and hair, dust mites, etc.). Physical factors (cold, heat, sunlight, friction and pressure), mental and endocrine factors and genetic factors can also cause urticaria. In addition, some systemic diseases (systemic lupus erythematosus, malignant tumors, metabolic disorders, endocrine disorders, autoimmune thyroiditis, ulcerative colitis, etc.) can also be associated with this disease. If the symptoms of urticaria appear in the body, it is recommended to go to the dermatology department of the hospital to identify the allergens and standardize the treatment.