The causes of tremor in both hands are considered to be idiopathic tremor, Parkinson’s, psychosomatic tremor and so on. 1. Idiopathic tremor: This disease is an autosomal dominant genetic disorder that causes uncontrollable hand tremor, tremor of the neck, voice, and head. There are usually no other symptoms and it is usually not life-threatening. 2. Parkinson’s disease: this is a common degenerative disease of the nervous system in the elderly, the first symptom is usually a static tremor of the hands, and at the same time, there will be the thumb and the index finger flexed between the pill-like movements, highly prevalent in the elderly. 3. Psychosomatic tremor: benign tremor caused by excessive tension, anxiety and fear, which usually occurs when stimulated and usually recovers on its own. The tremor of both hands should be clarified under the guidance of a professional doctor to identify the cause of the disease and carry out targeted treatment.