How long does it take for a squamous epithelial lesion to progress to cancer. Generally speaking, it depends on the patient’s own repair ability, the severity of squamous epithelial lesions, and the living habits, etc. A. If the patient has strong repair ability, the extent of squamous epithelial lesion is limited, and the patient pays attention to diet, never overeats, prohibits smoking and alcohol, lives regularly, avoids staying up late and straining. In this case, it is possible that the squamous epithelium will heal completely and will not develop into cancer. Secondly, if the patient’s own repair ability is poor, the lesion of squamous epithelium is extensive, and the patient often stays up late, strains, drinks a lot of alcohol, eats cold, stimulating and indigestible food, rarely participates in physical exercise, and the resistance of the body decreases, this will cause the lesion of squamous epithelium to aggravate progressively, and generally in about 2-4 years, it can develop into cancer.