The causes of sweaty hands in summer are physical factors, sweat gland secretion on the hands, and the influence of disease factors. 1. Physical factors: the summer climate is relatively hot, if the body metabolism function is abnormal, then the hands will be easy to sweat. This situation usually does not cause harm to the body, but it is recommended that appropriate supplemental water, so as not to affect the body’s metabolism. 2. Excessive secretion of sweat glands on the hands: If the secretion of sweat glands on the hands is more vigorous, there will also be excessive sweating. It is recommended to pay more attention to diet, eat less greasy food, drink more water as appropriate, and pay attention to hand hygiene to avoid germs breeding. If there are no other adverse symptoms, usually do not need special treatment, so do not worry too much. 3. Disease factors: in life, many diseases can lead to sweaty hands, such as hyperthyroidism, diabetes, obesity and so on. If the disease is caused by sweaty hands in summer, accompanied by other uncomfortable symptoms, it is recommended to pay close attention to, if necessary, can go to the hospital for examination. In most cases, sweaty hands in summer is a normal physiological phenomenon, so do not worry too much. However, if it is accompanied by other adverse reactions, you need to be vigilant and seek medical help in a timely manner.