Key Takeaways
- Explain what is known before describing what remains uncertain.
- Avoid guessing, excessive reassurance or vague phrases such as “We’ll see what happens.”
- Tell the patient why uncertainty remains and what could make the situation clearer.
- Provide a definite plan for investigation, monitoring and review.
- Check understanding and give specific safety-netting advice.
Introduction
Clinical uncertainty is common. Symptoms may fit several conditions, test results may be inconclusive or the diagnosis may become clearer only with time.
Patients need honesty, a clear explanation and confidence that their concerns are being taken seriously. Saying “I don’t know” without context can sound dismissive, while pretending to be certain can damage trust later.
The General Medical Council’s guidance on decision making and consent states that clinicians should explain uncertainties about diagnosis, prognosis and the likely effects of treatment. They should also be clear about the limits of their knowledge.
How to Explain Clinical Uncertainty Clearly
The following five steps can make an uncertain situation feel safer and more manageable.
1. Begin With What You Know
Start with the information that is reasonably clear from the history, examination or results.
For example:
“Your examination and blood tests have not shown signs of a serious infection. That is reassuring. However, they do not yet give us a definite explanation for the pain.”
Avoid absolute statements such as “There is definitely nothing serious” unless the evidence genuinely supports them. A more accurate phrase may be:
“I have not found anything today that suggests an immediate emergency.”
2. Explain What Remains Uncertain and Why
Be specific about the gap in knowledge. Symptoms may be at an early stage, several conditions may present similarly or a test may not provide a definite answer.
Useful phrases include:
- “There are two possible explanations that we need to consider.”
- “It may be too early for the pattern to be completely clear.”
- “I cannot yet predict how quickly this will improve.”
This is more helpful than saying:
“It could be anything.”
Use the same principles that help you explain medical conditions in plain English: avoid jargon and separate facts from possibilities.
3. Acknowledge the Patient’s Concern
You could say:
“I understand that not having a definite answer is frustrating.”
Then explore what the uncertainty means to them:
- “Is there a particular condition you are worried about?”
- “What is concerning you most at the moment?”
This allows you to ask about a patient’s ideas, concerns and expectations naturally. Avoid repeatedly saying “Don’t worry”. Reassurance is more credible when linked to evidence and a plan.
4. Replace Uncertainty With a Clear Plan
Even without a final diagnosis, explain what happens next. A clear plan may include:
- Further tests or a period of observation
- Treatment for the most likely cause
- A review date or expected timescale
- When referral or a second opinion will be considered
For example:
“The most likely cause is a viral infection, although I cannot confirm that today. We will review you in three days. If the symptoms have not improved, we will reconsider the diagnosis and whether further tests are needed.”
NICE guidance on shared decision making recommends helping patients understand their options, including their possible benefits, risks and consequences.
5. Safety-Net and Check Understanding
When the diagnosis is uncertain, the patient needs to know what changes would make the situation more concerning.
Explain:
- Which symptoms to watch for
- How urgently to seek help
- Whom to contact
- When follow-up will occur
Finish by asking the patient to describe the plan:
“Just so I know I explained it clearly, could you tell me what you will do if the pain becomes worse?”
This helps you check patient understanding. It also supports effective safety-netting advice in plain English.
Short Model Conversation
Doctor: “Your examination and initial tests have not shown an obvious cause for the pain. Importantly, I have not found signs of an immediate emergency.”
Patient: “So, you don’t know what it is?”
Doctor: “I cannot give you a definite diagnosis today. The most likely explanation is a minor infection, but the symptoms may need time to develop before we can be certain.”
Patient: “What happens now?”
Doctor: “We will review you in two days. I’ll also explain which symptoms mean you should seek help sooner. Does that plan make sense?”
Common Mistakes to Avoid
Try not to:
- Guess simply to provide an immediate answer
- List every possible diagnosis without context
- Use vague phrases such as “Wait and see”
- Offer reassurance that is not supported by the assessment
- End the consultation without follow-up or safety-netting advice
Final Thoughts
Explaining clinical uncertainty does not weaken patient trust when handled clearly. State what you know, explain what remains uncertain and provide a definite next step.
Patients may leave without a final diagnosis, but they should not leave without a plan.
If you would like to develop more confident ways of explaining uncertain diagnoses and treatment outcomes, book a consultation to discuss your goals and see how I can help.
References
General Medical Council (GMC) (2020, updated 2026) Decision making and consent. Available at: https://www.gmc-uk.org/professional-standards/the-professional-standards/decision-making-and-consent (Accessed: 12 August 2026).
National Institute for Health and Care Excellence (NICE) (2021) Shared decision making (NG197). Available at: https://www.nice.org.uk/guidance/ng197 (Accessed: 12 August 2026).