Whenever the body is hot, it will sting and itch, considering that it may be caused by eczema, cholinergic urticaria and so on. Eczema itself is a kind of allergic skin disease, may be caused by the skin in a long-term humid environment, but also may be caused by other reasons, easy to cause intense itching, especially in the heat, the skin temperature rises, itching obvious. There may also be cholinergic urticaria, often caused by exercise and sweating, eating spicy food or drinking alcohol, etc. When the body is hot, it stimulates the release of acetylcholine, which can easily lead to itchy skin, and due to the stimulation of sweat, which can also cause itchy skin. When the body is hot, itching, must pay attention to the care of the skin, try to avoid excessive sweating, if the symptoms continue to be unrelieved, you need to go to the hospital in a timely manner, under the guidance of the doctor to take treatment.