Tremor in the right hand when holding something is considered to be an action tremor. There are two types of action tremors, including positional and locomotor tremors. Positional tremor is a tremor that occurs when the limb is held in a certain position. Causes include physiologic tremor, or hyperphysiologic tremor. For example, tremor occurs when you are fatigued, anxious, or emotionally agitated, or when you are sick or have a fever. There are also endocrine disorders, such as hypoglycemia and hyperthyroidism, which can lead to hand tremors. Another common cause is idiopathic tremor, or tremor of unknown origin. The symptoms of idiopathic tremor are only tremors, but not the postural and gait abnormalities, limb stiffness, or slowness of movement that occur in Parkinson’s disease. There are also pharmacologic causes, such as the use of caffeine, hormones, anti-epileptic drugs, antidepressants, etc., which can cause hand tremors. Motor tremor is usually seen in diseases that involve the cerebellum, including cerebral infarction, cerebral hemorrhage, brain tumors, and so on.