The sensation of itchy lips can be very uncomfortable for the patient. The main causes of itchy lips are allergies, exposure to medications, lip trauma and weather. All these causes can cause itchy lips. Itchy lips caused by allergy may be due to the reaction of some cosmetics or sunscreen, toothpaste, etc. with the lips, resulting in an allergic reaction. Also foods containing preservatives, flavors and artificial flavors can cause allergies. Some medications can cause itchy lips as a side effect. These medications may also cause one’s lips to crack and bleed. And of course, some people have allergies to medications that cause itchy lips. Trauma to the lips can also cause itchy lips, and the habit of licking and biting the lips can lead to swollen and itchy lips. If these behaviors can be stopped, the itchy lips will disappear. However, as long as the lips are irritated, the symptoms will come back. Weather-induced itchy lips are caused by exposure of the lips to hot and cold temperatures, which can lead to lip inflammation, and is a relatively common cause of itchy lips. The main cause of itchy lips is allergy. In your daily life, you should pay attention to the cosmetics you choose to use and reduce your exposure to fragrances and other substances. This is the only way to prevent itchy lips.