Lung cancer misdiagnosis claims

A clear chest X-ray does not always rule out lung cancer. NICE’s referral guideline reminds GPs that chest X-rays can give false-negative results, and that patients whose symptoms persist or get worse should be reviewed rather than simply reassured.

Our medical negligence team, which handles clinical negligence claims against NHS and private providers, can tell you whether the delay amounts to a claim. We will assess the records without obligation and act on a no win no fee basis. Our delayed cancer diagnosis work is recognised by Legal 500 2026 and Chambers UK 2026.

When the right tests were not arranged

NICE guideline NG12 is the standard your GP is measured against on suspected cancer referrals. For lung cancer, it sets out when a GP should arrange an urgent chest X-ray and when they should refer straight to a specialist on the suspected cancer pathway. These thresholds are regularly missed in primary care.

NG12 says a GP should offer an urgent chest X-ray, which means within two weeks, to anyone aged 40 or over with two or more of these unexplained symptoms. For anyone aged 40 or over who has ever smoked, one symptom is enough.

• cough
• fatigue
• shortness of breath
• chest pain
• weight loss
• appetite loss

A suspected cancer pathway referral is expected for anyone aged 40 or over with unexplained haemoptysis, which means coughing up blood, and for anyone whose chest X-ray suggests lung cancer. On that pathway, cancer should be diagnosed or ruled out within 28 days.

NG12 also tells GPs to consider an urgent chest X-ray for anyone aged 40 or over with a persistent or recurrent chest infection, finger clubbing, swollen lymph nodes above the collarbone or persistently in the neck, chest signs consistent with lung cancer, or a raised platelet count. Many GP negligence claims involve repeated consultations for the same symptoms, and course after course of antibiotics, without a chest X-ray ever being arranged.

Why a “clear” chest X-ray is not the end of the story

Plain chest X-rays miss a meaningful proportion of early lung cancers. Tumours behind the heart, at the top of the lung, or smaller than around one centimetre can be hard to see on an X-ray but show clearly on a CT scan.

NG12 reminds GPs to be aware that chest X-rays can give false-negative results. A normal X-ray does not exclude lung cancer where red-flag symptoms persist. Those patients should be reviewed, and a GP who remains concerned can seek specialist advice or refer.

We also see cases where the X-ray was not, in fact, clear. The British Thoracic Society guidance on pulmonary nodules recommends follow-up scans at intervals that depend on the size and appearance of the nodule. A small nodule reported on an X-ray or CT scan and then never followed up is one of the most common patterns of negligence in this area.

By the time the patient comes back with worse symptoms, the nodule may have become a stage 3 or stage 4 tumour.

When NHS lung cancer screening should have caught it

The NHS lung cancer screening programme, which grew out of the Targeted Lung Health Check, is being rolled out across England. It started in areas with higher lung cancer rates and is not yet available everywhere. It is for people aged 55 to 74 who are registered with a GP and smoke or used to smoke.

Anyone assessed as high risk is offered a low-dose CT scan, designed to find lung cancer early, when treatment is most likely to succeed. People whose scans show small nodules may be invited back for more frequent scans.

We are starting to see claims where a patient in an area covered by the programme was wrongly left out, where a high-risk assessment was not followed by a scan, or where a nodule found on a screening scan was lost between the screening service and the local hospital. A missed recall scan can be just as serious.

Where screening should have found the cancer early and it was instead diagnosed at stage 3 or 4, there may be a strong claim. Each case depends on the records and on expert evidence.

What a lung cancer misdiagnosis claim needs to establish

A claim does not exist simply because something went wrong. We have to prove two things side by side.

The first is breach of duty. We have to show the care you received fell below what a reasonably competent GP, radiologist or respiratory physician would have provided. NICE NG12, the British Thoracic Society pulmonary nodule guidance and the Royal College of Radiologists reporting standards are the benchmarks.

Recognised examples of poor care include:

• repeated antibiotics for a smoker’s recurring chest infection, with no chest X-ray
• coughing up blood that was not urgently referred
• a lesion at the edge of the lung missed on a chest X-ray
• a small nodule reported but never followed up

The second is causation. Even where the care was poor, you only have a claim if earlier diagnosis would have changed your prognosis or treatment. This is where most lung cancer cases turn. We instruct independent respiratory physicians, thoracic surgeons and oncologists to compare what your treatment and outcome would have been at the missed appointment with what they are now. 

How the stage of diagnosis affects treatment and prognosis

Stage at diagnosis decides what treatment can do. 

Caught early, at stage 1 or 2, lung cancer can often be removed by surgery, either an open lobectomy or a less invasive video-assisted thoracoscopic surgery (VATS) procedure. The intent is curative. Many patients return to normal life within months.

Caught late, surgery is often no longer possible. The plan becomes a combination of platinum-based chemotherapy, immunotherapy such as pembrolizumab, radiotherapy, and in some cases palliative care to manage breathlessness, pain and weight loss. 

For some patients the delay turns a survivable cancer into a fatal one, and we also act for families in fatal medical negligence claims. Where lung cancer is identified early, surgery with curative intent is often possible. A later diagnosis may mean treatment can only manage the disease rather than remove it. That distinction is central to both the claim and the compensation.

What lung cancer misdiagnosis compensation typically covers

Where negligence contributed to a late lung cancer diagnosis, compensation typically covers both the direct impact on health and the financial consequences that follow.

In practice that includes:

• loss of earnings where the delayed diagnosis has stopped you working or shortened your working life
• the cost of private treatment you would not have needed had the cancer been caught earlier, including immunotherapy not available locally on the NHS
• care, oxygen equipment and home adaptations needed because of advanced disease or treatment side effects
• travel costs for hospital appointments and oncology visits
• future losses, including pension shortfall and earnings lost because life expectancy has been shortened, and claims by dependants where the patient has died

Our cancer misdiagnosis solicitors have recovered six-figure settlements in delayed cancer diagnosis claims. The figure in any individual case depends on the stage of cancer at the missed appointment, the stage at diagnosis, and the impact on the patient and family.

★★★★★

“Nicholas Leahy at Osbornes Law was a great help during a very difficult time for me and my family. He fought very hard for us and was always there for if we need advice. We as a family are happy with the compensation they managed to get for us.”

How long do you have to make a lung cancer claim?

You usually have three years to start a claim. The three years run from the date of the harm, or from the date you first knew that you had suffered a significant injury and that it may have been caused by something your doctors did or failed to do, if that is later.

You do not need to know that the care was negligent for the three years to start. Different rules apply in some cases:

• Children: the three years do not start until the child turns 18.
• Lack of mental capacity: if the injured person lacked capacity when the harm happened, the three years do not start until they regain it.
• Claims after a death: the family usually has three years from the date of death, or from the date they first knew the death may be linked to poor care. A claim cannot be brought if the person who died was already out of time.

The court also has a limited power to allow a claim after the three years have passed, but you should never rely on it. Speak to us as soon as you can.

Speak to a lung cancer misdiagnosis lawyer today

If you believe your lung cancer, or that of a partner, parent or relative you have lost, was missed, misdiagnosed or diagnosed too late, our medical negligence lawyers will review the case in confidence and without obligation. We act on a no win no fee basis, and we can tell you which time limit applies to you.

Call 020 7485 8811 or fill in the contact form below.