The weakness of hands may be related to physiological reasons, low potassium, cervical spondylosis, craniocerebral diseases and other reasons. 1. Physiological reasons: prolonged pressure on the hands and prolonged cold stimulation can lead to the symptoms of weak and tender hands. It can be effectively relieved by resting and keeping warm. 2. Low potassium: When the blood potassium in the body is low, the phenomenon of weak hands can occur. At this time, you should supplement potassium through diet or medication to relieve the symptoms. 3. Cervical spondylosis: when suffering from cervical spondylosis, it will compress the local nerve roots, thus damaging the nerves of the hands and causing numbness, weakness and weakness of the hands. 4. Cranio-cerebral diseases: such as intracranial tumor, cranio-cerebral trauma, cerebrovascular disease, etc., can also cause hand weakness, mainly in the lateral limbs. When the above phenomenon occurs, it is recommended to go to the hospital for consultation and targeted treatment after clarifying the cause of the disease.