If your body itches when it is hot, it is mostly considered to be caused by heat urticaria, and to a lesser extent, it may also be caused by eczema. Heat urticaria is mostly seen in young people, and all factors that make the body hot are triggering factors, such as exercise, increased ambient temperature, emotional stress, eating too hot or spicy stimulating food, drinking hot water, drinking alcohol, wearing tight clothing and other factors that cause itching and rash after the body gets hot. When heat urticaria occurs, you should get away from the allergen as soon as possible, keep your body cool, avoid emotional stress, and avoid eating excessively hot and spicy stimulating foods. Take oral antihistamines such as loratadine and levocetirizine under the guidance of a doctor, and use topical topical medication. The cause of eczema is complex, often as a result of the interaction of internal and external factors, such as the rise in the temperature of the external environment, as well as external stimuli such as sunlight, hot water scalding, etc. can trigger eczema, skin itching. Avoid contact with triggers when eczema occurs, avoid long-term exposure to high temperatures, pay attention to sun protection, and avoid scalding the skin with hot water. In addition, medication can be chosen under the guidance of a doctor, including local and systemic medication. If the skin is itchy, it should not be scratched frequently to avoid secondary infection.