Dry lips are mainly caused by dehydration, or some patients love to lick their lips, and when saliva becomes dry, the phenomenon of dry lips appears. Dry lips caused by water shortage, patients can pay attention to drink more water to replenish water on a daily basis. In addition, it may also be caused by factors such as drug stimulation: 1. Drug stimulation: drugs used to treat depression, anxiety, pain, allergies, diarrhea and other types of drugs, a common side effect is dry lips, such as antihistamines and decongestants. If the dry lips are caused by drug stimulation, it is recommended to change the medication or adjust the dose under the guidance of a doctor, you can also pay attention to more water in your life; 2, lip inflammation: lip inflammation is a general term for inflammation that occurs in the lips, and most lip inflammation will have the symptoms of dry and flaky lips. The main treatment for lip inflammation is local medication, common drugs include antibiotic drugs, anti-allergy drugs, etc., need to choose the medication according to the doctor’s guidance; 3, diabetes: diabetic patients lose a lot of water in the body due to polyuria, thus appearing dry lips. It is suggested that patients should actively treat diabetes and drink more water to relieve the symptoms of dry lips; 4.Dry syndrome: It is a chronic inflammatory autoimmune disease mainly invading salivary gland and lacrimal gland, mainly manifested as dry lips, also easy to suffer from dental caries, often feel dry choking when eating solid food, need to be served with water, etc.. You can take some drugs to promote saliva secretion, such as acetylcysteine, bromhexine tablets, etc.; 5, hyperthyroidism: hyperthyroidism patients have faster energy metabolism, increased heat production and accelerated heat dissipation, followed by dry lips, excessive sweating, fear of heat, moist skin and increased temperature. It can be treated with anti-thyroid drugs, such as methylthioxypyrimethamine and propylthioxypyrimethamine, which can relieve the symptoms of dry lips. In addition, dry lips are also associated with mental factors such as tension and anxiety, or the elderly due to atrophy of glands within the oral mucosa and reduced saliva secretion. Patients are advised to adjust their mindset and drink more water to relieve the symptoms.