Itchy skin in summer may be caused by physiological reasons, summer dermatitis, hives and other reasons. 1. Physiological reasons: summer air is dry, the temperature of the external environment is not suitable, if the skin is dry or skin cleaning is not in place, it may lead to itchy skin in the summer when it is hot. 2. Summer dermatitis: hot summer climate, high ambient temperature, skin sweating, sun exposure, etc., are prone to skin irritation, induced by summer dermatitis, manifested as pimples, erythema, accompanied by severe itching, resulting in itchy skin in the summer. 3. Urticaria: mainly heat contact urticaria and cholinergic urticaria. Thermal contact urticaria is an itchy phenomenon with a stinging sensation when the skin is stimulated by heat. Cholinergic urticaria, on the other hand, is caused by heat, exercise, etc. and manifests itself as itchy skin when it gets hot. Summer itchy skin when hot to rule out physiological causes, should promptly go to the regular hospital, under the guidance of the doctor, the relevant examination, clear cause of the disease after active treatment.