Itchy when sweating on the body may be itchy due to sweat stimulating some sensitive skin, or it may be itchy due to bacterial infection or diseases such as urticaria. When there is itching due to sweating on the body, you should promptly go to the dermatology department for consultation to clarify the cause and then carry out targeted treatment. 1, skin sensitivity: human sweat contains many components, including salt, urea, etc. People with more sensitive skin may be stimulated by these substances and itch; 2, bacterial infection: sweat is not cleaned up in time, it may also cause the accumulation of bacteria and a milder inflammatory reaction of the skin, causing itching and localized redness and swelling. Sweat should be dried in time, while washing the itchy parts with warm water, and the symptoms can generally be reduced. When the skin is dry and there is a heat rash, itching can be more obvious after sweating. Patients can apply moisturizer or toner after cleaning the skin to keep the skin healthy and reduce itching after sweating; 3. Urticaria: Cholinergic urticaria can also cause itchy skin after sweating. Cholinergic urticaria belongs to the allergic disease, after sweating the patient’s body choline release too much, basophils and mast cells release histamine, causing itching of the skin. It can recur and usually resolves spontaneously. Patients with more severe symptoms can use antihistamines to stop the itching under the guidance of a doctor and should not scratch excessively.