If it is brain atrophy, generally it does not cause dizziness; patients with mild conditions may not show any clinical symptoms. If it is severe, the main symptoms are those of dementia, such as possible sluggish reactions, memory decline, reduced computational abilities, impaired executive functions, and even psychiatric symptoms. The most common disease clinically observed is Alzheimer's disease. If the patient has cerebellar atrophy, even mild cases might not exhibit any symptoms. Severe cases can experience dizziness, primarily manifesting as feeling drunk, accompanied by unsteady walking, unstable standing, and other signs of ataxia.