Urticaria, commonly known as “bumps” or “rash”, is an edematous reaction of the skin caused by allergies that lead to increased dilation and exudation of small blood vessels in the skin. Urticaria manifests itself as sudden, edematous domes of varying sizes and shapes or patches of light red or skin-colored “bumps” (pimples), often preceded by itching and appearing after local scratching; it can also appear after heat, cold, or strenuous exercise, fading within 2 to 24 hours, leaving no trace, and can recur. In chronic cases, the disease can last for months or even years. Some patients may have discomfort such as nausea, vomiting, abdominal distension, diarrhea, chest tightness, etc. In severe cases, there may be a drop in blood pressure, and suffocation may occur in those with laryngeal edema. The etiology of urticaria is complex, with no clear cause found in about half of patients. Common triggers include: Food and food additives: mainly some protein-based foods, such as milk, eggs, seafood, etc., as well as colorings, flavorings, and preservatives added to food. Inhalants: such as pollen, dust mites, animal dander, etc. Infections: About 30% of acute urticaria are associated with infections, including bacterial infections, viral infections, and parasitic infections. Drugs: There are many drugs that can cause urticaria, such as penicillin, sulfonamide, some vaccines, aspirin, and angiotensin-converting enzyme inhibitor drugs. Drug-induced urticaria can occur up to one year after the drug is administered. Physical factors: mechanical stimulation, heat and cold, sunlight, etc. Mental factors and endocrine changes: such as emotional tension, mental stress. The chances of women suffering from urticaria during menstruation and pregnancy are also greatly increased. Internal diseases: such as hyperthyroidism, diabetes, autoimmune diseases, hyperlipidemia, gastric ulcer, gastritis, enteritis, liver disease, etc. Genetic factors: Some patients have a family history of urticaria. Patients with this disease should pay attention to: 1, reduce scratching, avoid hot compresses, hot water baths, the above practices can temporarily relieve itching, because scratching or thermal stimulation will cause local vasodilation, increased exudation, thereby aggravating the condition of urticaria. 2, dizziness, breathing difficulties, chest tightness and other discomfort promptly seek medical attention, be alert to the occurrence of anaphylaxis, asphyxia. 3, maintain a healthy state of mind. About 15% to 20% of patients have had hives at least once in their lives, and many patients can relieve themselves. Mental tension is also one of the contributing factors to urticaria, so keeping a happy mood is beneficial to preventing urticaria.