The causes of involuntary hand twitching include psychosomatic factors, cold stimulation, electrolyte disorders and so on. 1. Spiritual and psychological factors: when mental tension, emotional excitement, will lead to sympathetic nerve excitation, causing hand tremor, can also appear involuntary hand twitching. This is a normal physiological phenomenon. When the pressure is lowered, the spirit is relaxed and the emotions are eased, the symptoms will be relieved. 2. Cold stimulation: when in a cold environment, the muscles of various parts of the body can appear twitching, trembling, and produce heat to cope with the cold environment, so there can be involuntary hand twitching. 3. Electrolyte disorders: when patients suffer from calcium deficiency due to various reasons, involuntary twitching of hand muscles can occur. There are many other causes of involuntary hand twitching, it is recommended to go to the hospital as soon as possible for relevant examinations to clarify the cause of the disease, so as not to delay the condition.