A sun itchy body is generally due to solar dermatitis, solar urticaria and neurodermatitis and other causes. 1. solar dermatitis: mainly due to acute inflammatory reaction of the skin after exposure to the sun, resulting in patients with itchy skin symptoms, some patients will appear edema and erythema, belonging to photosensitive diseases. 2. Solar urticaria: skin diseases caused by bright light exposure, the main symptoms of erythema, doughnuts and itching, and in severe cases, chills, fainting symptoms. 3. Neurodermatitis: is a chronic skin disease, can be induced by sun exposure, mainly manifested as paroxysmal itching and other symptoms. A sun itchy body may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.