###Human: What could be the reason for my hand tremor? ###Assistant: Hi. Heavy smoking can lead to tremors in hands and so can tea and coffee if consumed heaviely. Slight tremors, particularly in the hands and fingers, is a normal phenomenon called physiologic tremor. It can get aggravated by stress or anxiety. You should cut down on smoking. If tremors do not disappear after cessation of smoking consult a physician and undergo some laboratory tests like estimation of thyroid hormone levels and blood glucose levels that can also cause tremors if found deranged.