Hand size generally can not become smaller, if it is caused by obesity fat, after weight loss and exercise may become smaller. The size of the hand is determined by the bone, hand bone development is generally related to genetic and nutritional, in the development of better nutrition corresponding to good bone growth, the opposite growth of the corresponding retardation, but the hand bone development, once mature, will not become smaller or larger. Obesity hand fat increases, resulting in wider, thicker hands, the general length will not change. If the hand fat is reduced through successful weight loss, the hand can become narrower and thinner while becoming smaller. If the normal size of the hand, it is recommended to let nature take its course and keep your mood relaxed. If you feel that your hand has increased abnormally, you should go to the regular hospital in time, and the doctor will determine the reason according to the specific situation.