Drinking a lot of water or dry lips may be diabetes or oral disease, etc., can be treated by improving lifestyle habits, medication (such as metformin, cephalosporin) and other treatments. 1. Diabetes: diabetic patients in addition to drinking a lot of water or dry lips, there are symptoms such as polyphagia, polyuria, weight loss. If this is the case need to be based on the classification of diabetes and the patient’s body type and other options to take drugs such as metformin to carry out treatment, while avoiding the consumption of sugary substances (such as steamed bread, etc.). 2. Oral disease: drink a lot of water or dry lips may also be the emergence of oral diseases, such as stomatitis, etc., this situation patients need to pay attention to their oral hygiene, dental scaling through daily brushing to maintain oral health, if necessary, choose to take metronidazole and other drugs for antibacterial treatment. Drinking a lot of water or dry lips there are many other reasons, patients find themselves in a similar situation and long-term no improvement, you need to consult a doctor in a timely manner, under the guidance of the doctor to improve the relevant examination and standardized treatment, treatment as prescribed by the doctor.