Elderly people are thirsty at night, it is not normal, it is likely to be diseases caused by thirst symptoms, common causes are diabetes, dry syndrome, uremia and so on. Diabetes is a very common disease, prevalent in the elderly, high blood sugar in the body will cause osmotic diuresis leading to excessive urine, followed by thirst. Diabetic patients with metabolic imbalance in the body, manifested by excessive drinking, eating, urination and weight loss, it is recommended to seek timely medical attention and follow the doctor’s instructions for fasting and postprandial blood sugar, insulin and other items. Dry syndrome is a disease of the immune system, patients in addition to thirst, and eyelid conjunctival dryness and other manifestations. Uremia is caused by hypothalamic-pituitary lesions that lead to insufficient secretion of antidiuretic hormone, which in turn causes polyuria. Generally, medication can improve the symptoms, but the prognosis for severe cases is poor. These are only some of the common causes. Elderly people who have persistent thirst symptoms should seek medical attention as soon as possible, after a clear diagnosis and standardized treatment in accordance with the doctor’s instructions.