Whether cerebellar atrophy is hereditary or not depends on the etiology of cerebellar atrophy: 1, normal aging, cerebellar atrophy is triggered by atherosclerosis, which is a normal pathophysiological manifestation of the aging of the organism, and therefore does not have heredity. 2, trauma-induced cerebellar atrophy is not hereditary. 3, cerebellar atrophy caused by carbon monoxide poisoning is not hereditary. Cerebellar atrophy is hereditary when the pathological changes are dominated by cerebellar damage symptoms and clinical manifestations centered on ataxia, and the patients have obvious family genetic background. Patients tend to develop the disease at a younger age, around 50 years old, and some will even develop the disease at around 20 years old. Most of these patients have autosomal dominant cerebellar ataxia or autosomal recessive ataxia, which is hereditary and untreatable.