Itchy skin when sweating consider sweat irritation, cholinergic urticaria, prickly heat and other causes. 1. Sweat irritation: the main components of sweat are water, sodium, potassium, etc., which can be acidic or alkaline. For some of the sweating skin itching, mainly related to sweat components to local skin irritation. 2. Cholinergic urticaria: the disease is related to exercise, emergency response, alcohol consumption and other factors. When the patient exercise sweat, it can be manifested as sweating skin itch, some patients are also prone to accompany the skin tingling sensation, burning sensation and round papules of wind. 3. Prickly heat: Prickly heat occurs in summer or in humid environments, and is mainly caused by obstruction in the ducts of the sweat glands. When prickly heat patients sweat, it can be manifested as itching, pain or burning sensation on the skin. Some patients also have small raised blisters, papules or dermatomes on the skin, and systemic symptoms such as headache and fever. It is recommended that people with itchy sweaty skin seek medical attention in order to clarify the cause of the condition and then follow the doctor’s instructions for treatment. When the body sweats, you can relieve the discomfort by bathing or dry toweling, and avoid scratching.