Oral cancer is far more common in India than in most countries, driven mainly by tobacco, gutkha, and heavy alcohol use. Warning signs include a mouth ulcer that does not heal within two weeks, a red or white patch, a lump, or persistent difficulty swallowing.
Early oral cancer is often painless, which is why so many cases are found late. A quick screening is a routine part of a dental check-up, so if you use tobacco or notice any lasting change in your mouth, get it looked at without delay; early detection dramatically improves survival.