The lips are getting thicker and thicker probably because of daily habits, but also because of illness. The main reasons are as follows: First, if you have the problem of licking your lips, it will easily lead to thicker and thicker lips, and regular licking of the lips will cause the skin of the lips to become drier and drier, resulting in the thickening of the cuticle of the epidermis of the lips, leading to thicker and thicker lips. Secondly, if there is a dental malformation, the upper jaw or lower jaw protrudes, the protrusion for a long time will lead to the lips protruding outward, thus visually looking like the lips are getting thicker. Third, the presence of chronic lip infection, caused by swelling and dryness of the lips, may also be lip inflammation or the appearance of periodontitis deformation and cause the lips to become convex. To sum up, if the lips become thicker and thicker, it is best to go to a regular hospital for oral examination in time and do periodontal treatment in time after diagnosis.