Which one is more serious, microcephaly or Alzheimer’s disease, should be analyzed according to the patient’s condition and underlying diseases. Patients with cerebellar atrophy often have symptoms and signs such as slurred speech, unsteady walking, decreased muscle tone and nystagmus. It mainly affects the patient’s movement, and the late stage of the disease causes the patient to be bedridden and unable to take care of himself. Alzheimer’s patients mostly show cognitive disorders, such as memory loss, slow reaction time, writing and arithmetic, language disorders, etc. In the late stage of the disease, psychiatric symptoms, behavioral abnormalities and activity disorders may occur. In the late stage of the disease, mental symptoms, behavioral abnormalities and activity disorders may occur. Both cerebellar atrophy and Alzheimer’s disease can have a serious impact on the patient’s normal life in the later stages of the disease. However, the severity of symptoms varies between different stages of the disease, and the speed of disease progression varies from person to person, so it is not possible to generalize the severity of the two diseases. It is recommended that patients with symptoms of cerebellar atrophy or Alzheimer’s disease should consult the Department of Neurology of regular hospitals in a timely manner, and under the guidance of professional physicians to improve the relevant examinations to clarify the diagnosis and cause of the disease and to give the corresponding standardized treatment to avoid delaying the condition.