In winter or when the weather is colder, the hands are very dry and have no moisture at all; but when the weather is hot or when the mood is fluctuating, the palms of the hands will bleed.

Handhidrosis, a disease called hyperhidrosis of the hands, is a very common functional abnormal local hyperhidrosis of unknown cause. Because of racial specificity, young people who grow up in subtropical areas are particularly prone to this problem. The secretion of sweat glands is controlled by sympathetic nerves, and palmar hyperhidrosis is caused by excessive tension of sympathetic nerves for unknown reasons, such as tension, excitement, stress or high temperatures in summer that cause an abnormal increase in perspiration on the palms.

Hyperhidrosis is not a disease, it is just an overactive sympathetic nervous system. However, the symptoms often cause problems in study, work or social life, and require medical treatment.

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Hope this helps