Hives and obesity are generally not related. Hives are mainly caused by food allergies, viruses, bacterial infections, improper use of drugs and environmental factors. 1. Food allergy: patients consume fish, shrimp, meat, milk, strawberries and other foods that are easy to cause allergies, can cause urticaria. 2. Viral and bacterial infections: Viral and bacterial infections such as upper respiratory tract viral infections, hepatitis, tonsillitis caused by staphylococcus aureus and other viral and bacterial infections lead to the emergence of urticaria in patients. 3. Improper use of drugs: patients vaccinated, the use of penicillin, serum preparations and other drugs lead to the emergence of allergic reactions caused by urticaria. 4. Environmental factors: patients inhale pollen, animal dander, etc. or skin contact with animal dander, certain plants, etc., resulting in urticaria on the skin. It is recommended that patients with urticaria go to the hospital, follow the doctor’s instructions for treatment, the use of drugs need to strictly follow the doctor’s instructions.