Delayed diagnosis of oral cancers: how suspicious symptoms should be investigated – and when failures may amount to negligence

Early diagnosis of oral cancer is critical. When symptoms affecting the teeth, gums, or oral cavity are overlooked or incorrectly attributed to routine dental problems, the consequences can be life‑altering. For many patients, what begins as a seemingly minor toothache or facial discomfort is later revealed to be a fast‑growing malignancy. When opportunities to diagnose the condition earlier are missed, individuals may be entitled to pursue a legal claim for negligent delay in diagnosis.

How mouth cancers typically present

Mouth cancers, including oral squamous cell carcinoma, lymphomas affecting the jaw or sinuses, and rarer cancers of the maxillofacial region, often begin with symptoms that appear harmless:

• persistent toothache;
• a loose tooth without clear dental cause;
• unexplained jaw or facial pain;
• difficulty blowing the nose or facial pressure;
• numbness, tingling, or swelling;
• a lump on the face, near the nostril, or within the mouth;
• non‑healing ulcers.

Because these symptoms overlap with everyday dental issues, early signs are sometimes missed. This is precisely why dental professionals play an essential role in recognising possible red flags.

How these cancers should be investigated

When a patient presents with symptoms that do not respond to routine dental treatment or exhibit unusual features, national guidelines require clinicians to take the possibility of malignancy seriously.

Appropriate investigations may include:

• dental X‑rays to assess bone loss or abnormal changes;
• urgent two‑week-wait cancer referrals if malignancy is suspected;
• CT or MRI scans where deeper structures may be involved;
• biopsies of suspicious masses;
• blood tests, particularly when lymphomas or systemic cancers are possible.

A typical example is bone destruction in the jaw or sinus area, which is something that should always prompt urgent further investigation. Where a dentist, GP, or specialist fails to arrange timely imaging or referral, a diagnosis may be delayed by weeks or months, potentially allowing the disease to spread.

The real impact of delayed diagnosis – case study

A recent claim settled by Alison Johnson, partner in Penningtons Manches Cooper’s medical negligence team, highlights just how closely serious oral and facial cancers can mimic common dental complaints and why prompt, appropriate investigation is essential.

A patient who became a client of the team initially experienced a loose tooth and a feeling of an odd sensation in his gum, as if he had something stuck in his teeth, despite having flossed trying to remove it. He made a dental appointment to have it looked at. An X-ray was taken but the dentist did not feel that it showed anything unusual. The client was reassured by his dentist that the problem was probably due to him grinding his teeth and the dentist even joked that it was just a case of what can happen with ageing. However, the symptoms progressed with increasing numbness and facial discomfort developing and the client became increasingly worried. He returned to his dental surgery, and this time saw a locum dentist, who was concerned about the neurological findings and made an urgent referral for maxillofacial hospital investigations. Those investigations revealed an aggressive sinus cancer, which was initially treated by surgery and radiotherapy. However, tragically the client experienced cancer recurrence, causing significant bone destruction in the jaw, damage to his eye socket resulting in the loss of his eye and the need for extensive treatment to try to keep the cancer under control for as long as possible.

After battling against debilitating side‑effects, significant fatigue, repeated hospital visits, and the knowledge that he had a terminal illness, he passed away leaving a widow and two teenage children. He had wanted to raise awareness of rare facial cancers by sharing his story, and his widow bravely continued his medical negligence claim after his death. The claim was contested and litigated but concluded at a settlement meeting after a significant amount of expert evidence had been served. His widow accepted a settlement offer that enabled her to financially support her two children through university, as she knew her late husband would have wanted to be able to do.

This story is a stark reminder that what appears to be a routine dental issue may in fact be a sign of a serious and fast‑growing cancer. Timely diagnosis can be the difference between limited‑stage disease and a more advanced, harder‑to‑treat condition.

When delayed diagnosis may amount to negligent care

A delayed diagnosis is not automatically negligence, but it can be if the care provided fell below an acceptable standard. Potential examples include:

• failing to take a patient’s symptoms seriously;
• not arranging X‑rays for unexplained tooth looseness or jaw pain;
• misinterpreting imaging suggestive of bone loss;
• not referring a patient on a two‑week suspected-cancer pathway when required, for example for unexplained neurological symptoms such as numbness, tingling, altered sensation;
• delays in communicating abnormal results;
• inadequate follow‑up when symptoms persist or worsen.

If earlier investigations should have been undertaken, the failure to arrange them fell below a standard of care that no reasonable and responsible body of medical opinion would support, and earlier diagnosis would likely have led to a better outcome, legal grounds for a claim may exist.

Could you have a legal claim for delayed mouth cancer diagnosis?

You may be entitled to pursue a compensation claim if you or a loved one experienced:

• worsening dental or facial symptoms that were repeatedly dismissed;
• delays in being referred for specialist assessment;
• imaging or investigations that should have been performed but were not;
• a diagnosis of mouth, sinus, jaw or lymphatic cancer later than expected.

Penningtons Manches Cooper’s team of specialist medical negligence solicitors can:

• review dental and medical records;
• identify avoidable delays in your care;
• obtain expert opinions on whether standards were breached;
• assess how those delays affected your prognosis, treatment, and outcome.

Compensation can help cover lost earnings, treatment costs, future care needs, and the wider impact of living with advanced cancer.