What does hives come from?

Urticaria has acute and chronic points. Acute urticaria is generally not difficult to find the cause, food is the most common cause, including fish, shrimp and other animal protein, mango, walnut, preservatives and other food additives can also cause urticaria. Many drugs are easy to cause this disease, such as penicillin, sulfa, various vaccines. In addition, physical factors such as friction, hot and cold, and sunlight exposure are also important causes of urticaria. Inhalation such as pollen, animal dander, feathers, and dust can cause the disease, and such patients are often accompanied by respiratory symptoms. The cause of chronic urticaria is difficult to find. Urticaria can also be caused by various chronic infectious factors such as cholecystitis, tonsillitis, and Helicobacter pylori infection in the stomach. In addition, autoimmune diseases such as hyperthyroidism and rheumatism can also cause urticaria. Mental stress, emotional impulse and other mental factors and endocrine changes can also induce detailed urticaria.