There is no such thing as limb dysfunction syndrome, clinically known as limb dysfunction, mainly due to some pathological factors caused by limb activity function limitation, such as vestibular dysfunction, cerebral infarction, cervical spondylosis, myasthenia gravis and so on. 1. Vestibular dysfunction: it may be a disorder caused by external stimulation of the vestibular and visual systems, also seen in extracranial lesions of vestibular nerves, which may cause balance disorders, most of which are manifested as gait abnormalities and easy to fall over when walking. 2. Cerebral infarction: it is a limited ischemic disease of brain tissue, which may be caused by atherosclerosis of intracranial and carotid large arteries. Initial manifestation is consciousness disorder, and quadriplegia and other symptoms may appear in the middle and late stages. 3. Cervical spondylosis: it is a degenerative disease of the cervical spine, mainly caused by cervical spinal stenosis and poor lifestyle. Symptoms such as radiating pain and numbness in the upper limbs may occur. 4. Myasthenia gravis: it is an autoimmune disease, which is mainly related to the disorder of the immune system. Patients may experience weakness of arms and legs. Limb dysfunction should be diagnosed and treated by professional doctors, please do not judge by yourself to avoid delaying the condition.