The early signs of mouth cancer often look like sores or patches that don't heal

Mouth cancer can appear as a sore, lump, or discolored patch inside your mouth or on your lips. The key difference from normal mouth injuries is that these changes persist for more than two weeks without healing. They may be white, red, or a mix of both. Some people notice pain or difficulty swallowing, while others have no symptoms at all in the early stages.

The location matters. Mouth cancer most commonly develops on the floor of the mouth, the underside of the tongue, the soft palate at the back of the mouth, and the inside of the cheeks. It can also start on the lips, gums, or the hard palate. Because these areas are easy to see or feel, catching changes early is possible if you know what to look for.

Key Takeaways

  • A sore, lump, or patch inside your mouth or on your lips that does not heal within two weeks warrants a dental or medical visit.
  • Mouth cancer often appears white, red, or speckled, and may feel rough or raised compared to surrounding tissue.
  • Pain when swallowing, difficulty moving your tongue or jaw, or numbness in your mouth can be warning signs even without a visible sore.
  • Many mouth changes are not cancer, but a healthcare provider can examine the area and determine whether a biopsy is needed.

White and red patches that don't go away

A white patch (called leukoplakia) or red patch (called erythroplakia) that stays in place for more than two weeks is a common early sign. White patches may look like a coating you could wipe off, but they don't disappear. Red patches often feel slightly raised or rough and may bleed easily if you touch them.

Mixed white-and-red patches are also possible. These patches may not hurt at first, which is why they are sometimes discovered by accident during a dental cleaning or when someone notices them while looking in a mirror. The appearance can be flat or slightly bumpy, and the edges may be irregular rather than sharply defined.

Lumps, thickening, and rough texture

A lump or thickened area inside your mouth that persists for more than two weeks is another sign to watch for. You might notice it by running your tongue over the area or feeling it with your finger. The tissue may feel hard, raised, or noticeably different from the surrounding area.

Rough or bumpy texture on the inside of your cheek, gums, or tongue can also indicate cancer, especially if the texture is new and doesn't match the rest of your mouth. Some people describe it as feeling like sandpaper or a small nodule. If the area is on your gums, it may bleed when you brush your teeth or eat.

Sores that bleed or don't heal

A mouth sore that bleeds easily, oozes, or doesn't close up within two to three weeks is worth investigating. Normal mouth sores from accidental cheek biting or sharp food usually heal within a week or two. A sore that persists, especially one that bleeds without obvious injury, may signal something more serious.

Some mouth cancers develop as an open sore with raised or rolled edges and a crater-like center. The sore may have a yellowish or grayish base. If you notice bleeding from inside your mouth when you haven't injured yourself, or if a sore reopens repeatedly in the same spot, contact a dentist or doctor.

Difficulty swallowing, numbness, or jaw changes

Pain or difficulty swallowing can be a sign of mouth cancer, especially if it lasts more than two weeks and you haven't had a cold or sore throat. Some people experience a sensation that food is catching or that something is stuck in their throat. This symptom may occur even when no visible sore is present.

Numbness or tingling in your mouth, tongue, or lips that doesn't go away can also indicate cancer. A change in how your jaw moves, difficulty opening your mouth fully, or pain when chewing are additional warning signs. Some people notice their voice sounds different or they have persistent hoarseness. These symptoms warrant a visit to a doctor or dentist for evaluation.

Swelling in your neck or jaw

Swelling in your neck, under your jaw, or behind your ear that lasts more than two weeks may be related to mouth cancer. The swelling may be painless at first. You might notice it when you touch the area or see it in the mirror as an asymmetrical bulge on one side of your neck.

Swollen lymph nodes can have many causes, including infection, but persistent swelling deserves medical attention. If you also have a mouth sore, patch, or other symptom listed here, the combination makes it more important to see a healthcare provider. A doctor can examine both the mouth and the neck to determine what is causing the swelling.

When to see a dentist or doctor

Any sore, patch, lump, or other change inside your mouth or on your lips that lasts longer than two weeks should be examined by a dentist or doctor. You do not need to wait for pain to develop. Many early-stage mouth cancers cause no discomfort, so the absence of pain does not mean the change is harmless.

If you have risk factors for mouth cancer—such as tobacco use, heavy alcohol use, or a family history of cancer—pay extra attention to changes in your mouth. People over age 40 are at higher risk. During routine dental visits, ask your dentist to check for any suspicious areas. If your dentist finds something concerning, they may refer you to an oral surgeon or oncologist for further evaluation.

A healthcare provider can perform a visual exam and, if needed, take a small tissue sample (called a biopsy) to determine whether cancer is present. Most mouth changes are not cancer, but getting them checked is the only way to know for certain.

Frequently Asked Questions

Can mouth cancer be painless?

Yes. Many people with early-stage mouth cancer have no pain at all. They discover the cancer only when they notice a sore that won't heal, a patch, or a lump. Pain often develops later as the cancer grows. This is why checking your mouth regularly and seeing a dentist if you notice any change is important, regardless of whether it hurts.

What's the difference between a canker sore and mouth cancer?

A canker sore (aphthous ulcer) usually heals within one to two weeks and is often triggered by minor injury, certain foods, or stress. Mouth cancer sores persist beyond two weeks, may grow larger over time, and often have irregular or raised edges. If a sore doesn't heal within two to three weeks, have it examined by a healthcare provider rather than assuming it's a canker sore.

Does a white patch in my mouth always mean cancer?

No. White patches can result from oral thrush (a fungal infection), leukoplakia (a precancerous condition), or other causes. However, any white patch that persists for more than two weeks should be evaluated by a dentist or doctor. They can determine the cause and recommend treatment if needed.

Should I be worried if I have a sore on my lip?

Lip sores are common and usually heal quickly. However, a sore on your lip that doesn't heal within two to three weeks, especially if it bleeds or grows larger, should be checked by a healthcare provider. Lip cancer is less common than cancer inside the mouth, but it does occur and is often caught early because the lips are visible.

Can I check my own mouth for cancer?

Yes. Once a month, look in a mirror and check inside your mouth, including your cheeks, gums, tongue, and the roof of your mouth. Feel for lumps or rough areas with your fingers. Look for white or red patches, sores, or swelling. If you notice anything unusual that lasts more than two weeks, contact a dentist or doctor. Regular self-checks help you notice changes early.