Oral cancer is a type of head and neck cancer that involves abnormal cell growth in the mouth. The most common type is squamous cell carcinoma, which can develop in the tongue, lips, palate, or other areas of the mouth. Symptoms may include white or red patches in the mouth, lumps or swelling, difficulty chewing or swallowing, or unexplained bleeding or numbness. Risk factors include tobacco, alcohol, and sun exposure. Early diagnosis through self-screening is important, as treatment options like radiation, chemotherapy, or surgery work best when cancer is detected early.