Rectal Bleeding and Change in Bowel Habit: Assessing the Standard of GP Care in Delayed Cancer Diagnosis Claims

Rectal bleeding and altered bowel habit are common presentations in general practice. Most patients with these symptoms will not have colorectal cancer, but the possibility of serious disease must be considered, particularly when symptoms persist, recur or remain unexplained.

For a GP expert witness reviewing an allegation of delayed diagnosis, the central question is not whether cancer could theoretically have been diagnosed sooner. Nor is it whether another GP might have chosen a different course. The relevant question is whether the decisions and actions taken were within the range expected from a GP acting with usual and ordinary skill and care, based on the information reasonably available at the time.

This article considers some of the recurring medico-legal issues in cases involving rectal bleeding, constipation, loose stools and delayed referral for suspected colorectal cancer.

Referral guidelines are relevant, but not determinative

Cancer referral guidance provides a useful structure for clinical decision-making. However, a guideline should not automatically be equated with the legal standard of care.

The analysis may become particularly difficult where:

• national guidance changed around the relevant period;

• local implementation occurred on a different timetable;

• a national guideline had been endorsed but not fully incorporated into local referral systems;

• the GP practice cannot confirm which pathway was operational;

• two contemporaneous documents used materially different referral criteria.

In such circumstances, the expert should not assume that the most recent guidance was necessarily the pathway used by the practice.

Normal tests do not necessarily explain persistent symptoms

Patients with colorectal cancer may have normal blood tests, and a normal digital rectal examination does not exclude pathology beyond the reach of the examining finger.

Similarly, tumour markers should not be treated as primary-care exclusion tests for colorectal cancer. A normal carcinoembryonic antigen result may have been available to the treating clinician, but it does not reliably rule out malignancy.

The correct expert analysis is usually not that a normal test was meaningless. It is that the result did not identify a cause for the symptoms and did not remove the need for appropriate clinical review in the context of ongoing unexplained symptoms.

A haemorrhoidal explanation must remain consistent with the findings

Rectal bleeding is commonly attributed to haemorrhoids or piles. That may be a reasonable working diagnosis, particularly where symptoms and examination support it.

However, a working diagnosis is not necessarily a final diagnosis.

If repeated examinations do not identify haemorrhoids, fissure or another satisfactory local source, persistent reliance on an anorectal explanation requires reconsideration. The need for reassessment becomes stronger if there is also:

• altered bowel habit;

• abdominal pain or tenderness;

• anaemia;

• unexplained weight loss;

• persistent or recurrent bleeding;

• unsuccessful symptomatic treatment.

The issue is whether continued reliance on it remained logically defensible as the clinical picture evolved.

Conclusion

Delayed colorectal cancer diagnosis claims require more than a comparison between the records and a referral guideline.

A robust GP expert report should:

• reconstruct the information available at each consultation;

• distinguish missing documentation from proof that a symptom was absent;

• analyse local and national referral guidance separately where necessary;

• avoid treating guidelines as determinative of the professional standard;

• consider benign explanations and medication effects fairly;

• interpret investigations accurately;

• assess the cumulative clinical picture;

• identify the most defensible decision point for clarification or referral;

• distinguish routine from urgent referral;

• keep primary-care opinion separate from oncological causation.

Assessing the Standard of GP Care in Delayed Bowel Cancer Diagnosis Claims

A clear, balanced and logically reasoned report can assist both claimant and defendant solicitors by identifying which aspects of care were within the reasonable range, which depend on disputed facts or guidance, and which decisions require further explanation.

Medico-legal GP expert evidence

I accept instructions relating to general practice care, including delayed diagnosis, suspected cancer referral, investigation follow-up, safety-netting and the interpretation of primary-care records.

Reports are prepared independently for the court, with clear separation between:

• established facts;

• reasonable clinical inferences;

• alternative factual assumptions;

• applicable professional standards;

• matters requiring specialist causation evidence.

For enquiries about a potential instruction, please provide a concise case summary, the allegations or questions to be addressed, the relevant date range, the jurisdiction, the volume of medical records and any proposed deadline.