Elderly people may be confused due to aging, insufficient blood supply to the brain, Alzheimer’s disease, chronic obstructive pulmonary disease and brain atrophy. 1. Aging: Due to aging, all physiological functions of the body deteriorate to varying degrees, the basal metabolic rate decreases, and the brain slows down the processing of information, thus causing confusion. 2. Insufficient blood supply to the brain: Older people with high blood lipid levels leading to blood viscosity, atherosclerotic stenosis of cerebral arteries, cervical spondylosis compression of vertebral arteries and other factors lead to insufficient blood supply to the brain, brain cells are deprived of oxygen, brain function is limited, so they will be confused. 3. Alzheimer’s disease: also known as dementia, may be related to genetic factors, patients with amyloid deposition in the brain tissue leading to abnormal nerve cell function, so confused, while memory loss, cognitive decline. 4. Chronic Obstructive Pulmonary Disease (COPD): chronic obstructive pulmonary disease (COPD) in the elderly has irreversible narrowing and blockage of the airways, leading to pulmonary ventilation dysfunction and chronic hypoxia in the brain and confusion. 5. Brain atrophy: it may be related to trauma, aging, infection and other factors, the brain volume decreases, dysfunction, so it will be confused. Elderly people may be confused with a variety of factors, it is recommended to consult a doctor for a clear diagnosis.