Examples of Medical Negligence: When Poor Care May Lead to a Claim

What counts as medical negligence?

Medical negligence, sometimes called clinical negligence, does not simply mean that treatment was unsuccessful or that a patient is unhappy with their care. A claim generally requires evidence that the care fell below the standard reasonably expected and that this caused or materially contributed to avoidable injury or loss.

These two questions are often described as breach of duty and causation. Both matter. Care can fall below the expected standard without causing additional harm, and a patient can suffer harm even where reasonable care was provided. Independent medical evidence is usually needed to assess what should have happened and whether it would probably have changed the outcome.

A duty of care can arise in NHS and private treatment and across hospitals, GP practices, dental practices, pharmacies and other healthcare settings. The facts, medical context and evidence must be considered individually.

Misdiagnosis or delayed diagnosis

A diagnosis may be missed, incorrect or made later than it reasonably should have been. This can happen where important symptoms are not properly investigated, test results are misunderstood, a referral is not made or a diagnosis is not reconsidered when symptoms persist.

A diagnostic error does not automatically establish a claim. The investigation must also consider whether a reasonably competent clinician would have acted differently at the time and whether an earlier correct diagnosis would probably have prevented or reduced the harm.

• Failure to investigate red-flag symptoms
• A delayed specialist referral
• Failure to review a diagnosis when symptoms worsen
• A missed cancer, stroke, infection or fracture where earlier action may have changed the outcome

Surgical errors

Every operation carries risks, and a complication can occur even when surgery is carried out carefully. Surgical negligence concerns avoidable failures in planning, performance or aftercare that fall below a reasonable standard and cause additional harm.

Questions can also arise about consent. Before treatment, patients should generally receive enough information about material risks and reasonable alternatives to make an informed decision. The advice required depends on the treatment and the individual patient.

• Operating on the wrong site or performing the wrong procedure
• Avoidable damage to surrounding organs, nerves or tissue
• Leaving a swab or instrument inside the body
• Failure to recognise or respond appropriately to post-operative deterioration

Medication errors

Medication errors can occur when a medicine is prescribed, dispensed, administered or monitored. Many errors cause no lasting injury, so the consequences and the action taken after the error are important parts of any assessment.

• The wrong medicine or dose
• Failure to consider a recorded allergy or important interaction
• Administration to the wrong patient
• Failure to carry out necessary monitoring or respond to an adverse reaction

Birth and maternity care

Pregnancy and birth require careful monitoring of both mother and baby. Concerns may arise where warning signs are not acted on, fetal monitoring is not interpreted reasonably, delivery is avoidably delayed or an injury to the mother is not identified and treated appropriately.

Maternity cases can involve complex questions about timing, cause and long-term needs. A serious outcome alone does not prove negligence; the records and appropriate expert evidence are central to understanding whether different care would probably have made a difference.

A&E care

Emergency departments often work under pressure, but patients should still receive a reasonable assessment and response to the information available. A review may be appropriate where serious warning signs were overlooked or a patient was discharged without necessary investigation, treatment or safety-netting advice.

• Failure to recognise signs of sepsis, stroke or another time-critical condition
• Failure to arrange appropriate tests or imaging
• A missed fracture or other injury
• Unsafe discharge or an avoidable delay in escalation

GP care

GPs are often the first point of contact and decide whether symptoms can be managed in primary care or need investigation or specialist referral. Potential concerns include not acting on abnormal results, not referring when clinically indicated, prescribing errors or not arranging review when symptoms continue or worsen.

The assessment is based on the symptoms and information reasonably available at the relevant appointment. It is not made solely with the benefit of hindsight.

Radiology and test reporting

Scans, X-rays, blood tests, biopsies and screening results must be interpreted, reported and communicated through the clinical team. Problems can arise where an abnormality is not identified, a result is incorrectly reported, the report does not reach the right clinician or no appropriate action follows.

These cases often overlap with delayed diagnosis. It remains necessary to consider what a reasonable report or response should have been and whether earlier action would probably have altered treatment or outcome.

Inadequate follow-up and aftercare

Reasonable care can include arranging reviews, chasing outstanding results and giving clear advice about warning signs after discharge. A lost referral, an unreviewed result or a failure to respond to deterioration may be significant if it causes an avoidable delay or additional injury.

The investigation will usually look at the complete pathway rather than one appointment in isolation, including handovers and communication between different services.

What does not automatically amount to negligence?

A poor experience deserves to be taken seriously, but it does not always meet the legal test for a compensation claim. A recognised complication, an unsuccessful treatment or a difference between two reasonable clinical approaches may occur without negligence.

Communication problems, long waits or an unhelpful manner can justify a complaint and may identify opportunities to improve care. For a negligence claim, however, there generally also needs to be a breach of duty that caused or materially contributed to injury or loss.

• A disappointing outcome where reasonable care was provided
• A recognised risk that occurred despite appropriate treatment
• A reasonable clinical judgment that another clinician might have approached differently
• A delay or service problem that did not cause additional harm

What evidence may matter?

Medical records often provide the starting point. They can show the symptoms reported, observations, tests, treatment decisions, referrals, results and follow-up. Records are important but may not answer every question, so witness evidence and independent expert opinion can also be relevant.

It can help to write a clear chronology while events are fresh and keep copies of correspondence, complaint responses and documents showing the effect of the injury. Evidence of losses may include time away from work, care provided by family, travel, treatment and rehabilitation costs. You do not need to obtain every document before making an initial enquiry.

What should you do next?

Your health comes first. Seek appropriate medical attention if you remain unwell and ask about a second opinion where necessary. Write down the main events, dates and people involved, and keep relevant letters and messages.

You may also use the provider’s complaints process. In England, an NHS complaint can normally be made to the service provider or the commissioner, with unresolved complaints potentially referred to the Parliamentary and Health Service Ombudsman. NHS Wales introduced its Listening to People complaints, incidents and redress process in April 2026. A complaint and a legal claim are different processes.

Time limits can be strict. For many personal injury claims in England and Wales, the usual period is three years from the date the cause of action arose or the later date of knowledge, although important exceptions can apply. Taking advice early allows time for records and expert evidence to be considered.