Angular cheilitis is generally caused by a deficiency in certain vitamins in the patient or a decrease in their immune resistance. It can also occur in dry seasons if the patient does not take proper care of their lips or fails to hydrate adequately. This can lead to the manifestation of angular cheilitis. Angular cheilitis does not usually cause infection as it is associated with the body's own bacterial infection or internal diseases and is not considered a contagious disease. Furthermore, when a patient exhibits symptoms of angular cheilitis, it is crucial to maintain cleanliness in the affected area, promptly remove any food residues, and pay attention to local disinfection. The application of anti-inflammatory ointments can be beneficial for the recovery of angular cheilitis. Additionally, it is important for patients to hydrate frequently and consume foods rich in vitamins, which can significantly aid the healing process of angular cheilitis.