Brain atrophy, women urinate 20 times, usually associated with autonomic dysfunction, urinary system inflammation, intracranial fluid and other factors. 1. Autonomic dysfunction: brain atrophy may affect the nerve function after serious, causing autonomic dysfunction, easy to cause urinary and fecal incontinence, in this case the patient will appear frequent urination, urination increased. 2. Inflammation of the urinary system: for example, urethritis, cystitis, etc., affected by inflammation may appear frequent urination, urinary urgency, urinary incontinence, the number of times of urination will be significantly increased, and even up to 20 times a day. 3. Intracranial pressure accumulation: it is a complication of cerebral atrophy. When the amount of intracranial pressure accumulation increases, it may increase the amount of excretion, thus leading to an increase in the number of urination. Increased urination in patients with cerebral atrophy is generally a manifestation of the aggravation of the disease, but may also be caused by other factors. It is recommended to go to a regular hospital in time, combined with the doctor’s advice, targeted treatment, to avoid deterioration of the condition.