Ataxia is a disorder of coordination of movement in the presence of normal muscle strength. It is a disorder of the amplitude and coordination of random limb movements, as well as the inability to maintain posture and balance of the body. It does not include mild paralysis of the limbs, eye muscle paralysis, difficulty in random movement due to visual impairment, or disuse due to brain lesions. Depending on the location of the lesion, ataxia can be divided into four types: 1. cerebellar ataxia. 2. 2. Cerebral ataxia. 3. Sensory ataxia. 4, vestibular labyrinthine ataxia. Clinical manifestations 1. Ataxia is observed by the patient’s daily life movements, such as dressing, fastening, carrying water, writing, eating, speech, gait, etc. 2, walking instability, gait staggering, inflexible movements, walking with legs widely separated; adult onset, walking can not be straight. It is a scissor pace, a “Z” shaped forward skew, and efforts to maintain the stability of the body with the help of both upper limbs. 3. The change of muscle tone may change from lowering to spasticity with the lesion, and the ataxic gait may also change to spastic ataxic gait. Unstable standing, body leaning forward or swaying from side to side, when standing on the toes or standing on the heels, swaying instability is more prominent, easy to fall is often the patient’s early complaint. 4. Patients often say, “When walking on paths or uneven roads, walking instability is more obvious and easy to fall. As the disease progresses, patients may show unsteadiness or inability to sit up and down until they are bedridden. Lack of sequence or organization of movements, irregularity, confusion and uncoordinated a manifestation. Clinical typology 1. Dynamic ataxia, which occurs at the time of movement, is characterized by imprecise and asymmetrical movements. Finger-nose test, finger-finger test, ankle-knee-shin test, and alternating movement test can be used to check for positive results. 2, static ataxia, is the patient upright, two feet tightly together, two hands raised forward flat, closed eyes can not stand (also known as closed eyes difficult to stand sign).