There are many reasons for chapped lips, some of which are seasonal, especially in winter, when the temperature is low and the weather is dry. If you don't have the habit of drinking water regularly, the spicy diet will easily cause chapped lips and oral ulcers. Some are caused by other abnormal conditions, some may be caused by Sjogren's syndrome and dehydration, some are caused by vitamin A and vitamin B deficiency in the body, and some are caused by stomatitis. If it is caused by seasonal reasons, you need to pay attention to drink more boiled water every day and have a light diet. You can always use some lip balm, which will help you improve. More importantly, you need to be careful not to have the bad habit of licking your lips. If it is caused by other abnormal conditions, it is necessary to take corresponding symptomatic treatment under the guidance of a doctor.