Cerebellar atrophy in young people is most often due to genetic factors, and less often due to carbon monoxide poisoning and trauma. Early symptoms may show inflexibility in movement response, such as not being able to touch the bowl accurately when holding it, and slow movement. Unsteady walking, no obvious abnormality when walking on the main road in the early stage, when walking in the field or walking in the narrow road near the river, the symptom of unsteady walking will appear, and it is easy to fall into the river. With the development of the disease, the patient also shows unsteady gait when walking down the stairs, easy to fall, and in serious cases, when walking on the flat ground, there will be obvious drunken gait, easy to fall. Memory loss, forgetfulness, forgetfulness, and less responsive than before. Poor ability to recognize distance, such as not being able to play tennis or table tennis.