Itchy bumps all over the body, consider may be urticaria, most can not find the exact cause, the common causes are food factors, drug factors, physical factors, infectious factors, as well as respiratory tract inhalants and skin contact, chronic body diseases. 1. Food factors: such as taking certain animal proteins, plant proteins, and plant and food additives. 2. Drug factors: the use of certain antibiotic serum preparations, various vaccines, etc. may also induce urticaria. 3. Physical factors: external temperature changes, sunlight stimulation, physical friction, mechanical pressure, etc. 4. Infectious factors: such as viral infections, bacterial infections, fungal infections, parasitic infections, etc. may also induce urticaria. 5. Respiratory inhalants and skin contacts: pollen in the air, dust mites, contact with animal fur and hair, etc. 6. Chronic diseases of the body: such as chronic diabetes mellitus, systemic lupus erythematosus, malignant tumors, ulcerative colitis, endocrine disorders and other diseases, may also induce urticaria. The whole body itchy air masses may have other reasons, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to comply with medical advice.