Hand sweating can be a normal function of the body under certain circumstances. Excessive hand sweating however is defined as sweating that goes beyond the normal physiological needs of the body. This excessive sweating is known in the medical community as hyperhidrosis. The palms of the hands are not a typical place for normal sweating of the body. If a person is sweating from his or her palms under normal conditions (non-active, no stress or excitement, normal temperature, social interaction) then they may have hyperhidrosis. Hyperhidrosis is a genetically inherited condition which causes social and functional problems in everyday life.
For additional information on sweaty palms: