The reasons for the falling of the hand include physiological factors, cerebrovascular lesions, cervical spondylosis, epileptic seizures and so on. 1. Physiological factors: if the patient’s attention is not focused when holding something, it may be manifested as the symptom of dropping something. 2. Cerebrovascular lesions: for example, cerebral infarction or cerebral hemorrhage will lead to damage to the central nervous system, which may result in unilateral weakness of the limbs and dropping of things, which may be accompanied by other symptoms such as dizziness and headache. 3. Cervical spondylosis: When cervical spondylosis exists, it may compress the nerves innervating the upper limbs, resulting in weakness of the hands and dropping of things, and may be accompanied by other symptoms such as radiating pain in the upper limbs and numbness of the upper limbs. 4. Epileptic seizure: at the onset of this disease, due to the highly synchronized abnormal discharge of neurons in the brain, there are symptoms such as limb convulsions, weakness and so on, and after the onset of the disease, there may be the manifestation of the hands dropping all the time. It needs to be diagnosed in combination with EEG and other tests. It is recommended to consult a doctor as soon as possible to clarify the cause of the disease and treat it in time so as not to delay the condition.