The short answer
Clinical trials are research studies that test new ways to prevent, find, or treat disease. Before joining one, it helps to understand the trial's purpose, its risks and benefits compared to standard treatment, your rights as a participant, what it might cost, how it could affect your daily life, and what your other choices are. Bring the questions that matter most to you.
Ask about the trial's purpose and why researchers think the studied treatment may — or may not — be better.
Ask about the possible risks and benefits, and how they compare to standard treatment.
Ask how your information is kept private, and what happens if you decide to leave the trial.
Ask which costs you'd pay, and which insurance or the study would cover.
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The full explanation.
Why these questions matter
Clinical trials are research studies that test new ways to prevent, find, or treat disease. Considering one adds extra questions on top of a regular treatment discussion — about the study itself, your rights, the costs, and how it fits into your life. Having a list ready helps you cover this ground without missing something important.
These prompts are adapted from questions the National Cancer Institute suggests for people considering a clinical trial.
The essentials
- What is the purpose of this trial?
- Why do researchers think the treatment being studied may be better than the current standard treatment — and why might it not be?
- How long would I be in the trial, and how many visits would it involve?
- What tests or treatments would I receive, and how will you know if it's working?
- Who is in charge of my care while I'm in the trial?
About risks, benefits, and your rights
- What are the possible side effects or risks?
- What are the possible benefits, and how do they compare to standard treatment?
- How is my information kept private?
- If I decide to leave the trial, what options remain for my care?
About costs and daily life
- Which costs would I be responsible for, and what would insurance or the study cover?
- Who can help me with insurance questions related to the trial?
- How would the trial affect my daily life, including travel and any hospital stays?
- What check-ups would I need after the trial ends?
Comparing your choices
- What are my other treatment choices, including standard treatment?
- How do those choices compare to this trial?
- What happens if I choose not to have any treatment right now?
Make it yours
Clinical trial decisions often benefit from more than one conversation. It can help to:
- Ask for written materials about the trial to review at home.
- Bring a family member or friend to the discussion.
- Ask who to contact — a doctor, nurse, or study coordinator — with questions that come up later.
- Take time before deciding, if your situation allows it.
The takeaway
A clinical trial is one option among several, not a leap into the unknown. Questions about the purpose, the risks and benefits, your rights, the costs, and how it compares to your other choices can help you decide whether it's worth pursuing for your situation.
Words to know
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Common questions
How many questions should I bring to a clinical trial appointment?
As many as you need. Clinical trials involve more moving parts than standard treatment discussions — purpose, risks, costs, logistics — so it's common to bring a longer list and go through it over more than one conversation.
What if I decide I want to leave a trial after joining?
It's worth asking about this before you join. Ask what options remain for your care if you leave the trial, so you understand the situation ahead of time rather than during a stressful moment.
Is it okay to ask how a trial compares to standard treatment?
Yes. Understanding how the studied treatment compares to standard treatment — and what happens if you choose no treatment at all — is one of the comparison questions worth asking before deciding.
Questions to ask your doctor
Being prepared helps you get the most out of your appointments. Save or print these questions.
Tap a question to save it to your list (kept on this device).
Your next step
Pick the questions that fit your situation, then print or save them.
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Last updated: 2026-08-11Next planned review: 2027-07-14
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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