The difference between AIDS and urticaria lies in the differences in causes, symptoms and treatment modalities. 1. Causes: AIDS is caused by human immunodeficiency virus infection, while urticaria is generally due to allergies, physical stimuli, mental overstress and other factors, resulting in increased permeability of the capillaries under the skin. 2. Symptoms: The common symptoms of AIDS are various opportunistic infections and tumors, etc. Urticaria is usually manifested as erythematous spots, wind masses, often accompanied by obvious itching. 3. Treatment: patients with urticaria can generally be cured by staying away from allergens and using medications under the guidance of a doctor, such as levocetirizine hydrochloride oral solution, ebastine tablets and other drugs. Patients with AIDS can take antiviral drugs as prescribed by the doctor, which can control the condition and there is no cure yet. AIDS and urticaria are two different diseases and should be judged under the guidance of a doctor. If uncomfortable symptoms appear, consult a doctor immediately.