What should you know about mouth cancer due to smoking?

Smoking can damage the mouth's lining and raise the chance of mouth cancer; persistent changes need clinical assessment. Tobacco smoke contains substances that can injure cells over time. Stopping smoking can support your general health and may be part of care after diagnosis, but it does not replace an examination.

Mouth cancer, also called oral cavity cancer, can begin in areas such as the lips, tongue, gums, inner cheeks, the floor of the mouth or the roof of the mouth. Smoking is one factor that can contribute to the DNA damage involved in cancer development. Other exposures and personal factors may also matter, so a diagnosis cannot be assigned from smoking history alone.

Possible changes include a sore that does not heal, a persistent red or white patch, a lump or thickened area, unexplained bleeding, numbness, loose teeth, or difficulty chewing, swallowing or moving the tongue. These symptoms can have causes other than cancer, but a clinician should assess changes that persist or worsen.

Arrange an appointment with a dentist or doctor if a mouth change is not settling. The assessment may include an examination of the mouth and neck, questions about tobacco and alcohol exposure, and a referral for further tests. A biopsy may be needed to examine tissue and confirm what is causing the change.

If mouth cancer is confirmed, the team considers the tumour's location and size, nearby tissues and lymph nodes, and your overall health. Treatment may involve tumour removal surgery, radiotherapy, or a combination. Support for stopping smoking can help you choose a practical plan and manage withdrawal.

Book prompt clinical advice for a mouth ulcer, patch, lump, pain, bleeding or numb area that persists, returns, or changes. Seek urgent help if swelling makes breathing difficult, if you cannot swallow fluids, or if bleeding is heavy or does not stop with gentle pressure.

Do not wait for pain: mouth cancer can sometimes cause a visible or textured change before it becomes painful. Bring a list of medicines, describe when the change began, and mention current or past smoking, vaping and other tobacco use.

Ask what might explain the mouth change, whether a biopsy or scan is needed, and how soon the results will be available. If cancer is diagnosed, ask where it is located, whether nearby lymph nodes need assessment, which treatments are being considered, and how each option could affect speech, eating, swallowing and appearance.

You can also ask for help stopping smoking, including medication or behavioural support, and what symptoms should lead you to contact the team between appointments.