14 years old hand tremor may be caused by physiological factors (mental, psychological), pathological factors (hyperthyroidism, hepatomegaly, etc.). 1. Physiological factors: (1) Mental factors: excessive tension in studies, high stress, lack of sleep, etc. lead to hand tremors, which can usually be relieved by releasing emotions. (2) Environmental factors: cold weather, wearing thin clothes, feeling cold, so hand shaking, cold hands and feet. 2. Pathologic factors: (1) Hyperthyroidism: mainly manifested as mental exuberance, body thinning, sweating, increased appetite, trembling hands and other symptoms. (2) Hepatomegaly: this is a hereditary disease, which can show symptoms of trembling hands. It is recommended to consult a doctor in time to find out the cause of the disease and treat it as soon as possible.