The left and right hands are not the same size is actually a phenomenon of normal physiological development, because the left and right hands are just like the leaves in the world, there is no exactly the same leaves, so there is no exactly the same size of the hand, even if it is the same person’s hands, the left and right sides of the process of development may be different in size. In addition, it may also be due to the patient’s development, it is likely that the right hand will favor the right side of the development of the left hand is the auxiliary hand, so the development of the left hand may be relatively delayed, which will lead to the patient’s left and right hand size is not equal to the situation, but this situation is generally within the normal range, so it will not affect the patient’s daily life, and suggest that the patient does not need to worry too much. If there is too much difference between the size of the left and right hands, you can go to the hospital for relevant examinations, which may be caused by the contracture of the muscles of the smaller hand.