Medical fitness to dive (and the dive medical form)
Before any course you'll fill in a medical questionnaire. Here's what it asks, when it means seeing a doctor first, and how to avoid a last-minute surprise.
Every reputable dive course starts with a short medical questionnaire. It's not red tape — it exists to make sure diving is safe for you, because the underwater environment puts unusual demands on your heart, lungs, ears and circulation. Most people tick 'no' to everything and dive the same day. But a single 'yes' can mean you need a doctor's sign-off first, and finding that out at the dive shop on arrival is a frustrating (and avoidable) way to start a trip. Here's how it works. This is general guidance — only a doctor can clear you to dive.
What the medical questionnaire is
Before training, dive operators ask you to complete a standardised diver medical form (the major agencies use very similar versions). It's a yes/no checklist about your health history — heart, lungs, ears, sinuses, neurological conditions, diabetes, recent surgery, pregnancy, certain medications, and more. Answer it honestly: it's there for your safety, not to catch you out.
If you answer 'no' to everything
You sign the form and you're generally good to go — no doctor's visit needed. This is the case for most healthy adults.
If you answer 'yes' to anything
A 'yes' doesn't mean you can't dive. It means a physician needs to review that item and sign a medical-fitness statement before you start in-water training. Many conditions are perfectly compatible with diving once a doctor has assessed them — the form simply routes you to the right person to make that call.
Sort the medical out before you travel
If anything on the questionnaire might apply to you, see a doctor — ideally one familiar with diving medicine — well before your trip. Getting clearance at home is far easier than scrambling for an appointment at your destination. Never guess, downplay, or hide a condition on the form: honest answers and a proper medical opinion are what keep you safe. Only a doctor can decide your fitness to dive.
Common things that prompt a doctor's review
Without turning this into medical advice, these are the kinds of topics the form flags for a professional opinion. If any apply to you, plan to speak to a doctor first:
- Heart or circulatory conditions, or high blood pressure being treated.
- Asthma, lung conditions, or recent respiratory illness.
- Recurrent ear or sinus problems, or recent ear surgery.
- Diabetes, epilepsy or other neurological conditions.
- Recent surgery or significant injury.
- Pregnancy, where the usual guidance is to avoid diving.
- Certain regular medications.
This list is illustrative, not exhaustive — the actual form is the authority, and your doctor is the decision-maker.
Why diving asks more of your body than it looks
It's easy to assume a gentle drift dive is no more demanding than a swim. Underwater, though, your body works under conditions it never meets on land: increased pressure on air spaces, breathing dense gas through a regulator, cold, exertion against currents, and the effects of nitrogen. That's why a few conditions that are barely noticeable day-to-day matter more underwater — and why the questionnaire exists. Understanding this makes the form feel less like an obstacle and more like the sensible safeguard it is.
What a dive medical actually involves
If the form sends you to a doctor, the visit is usually straightforward. A physician — ideally one familiar with diving medicine — reviews your history, asks about the flagged item, and may do a basic check relevant to it. In many cases they simply sign you off as fit to dive. Sometimes they suggest precautions or a follow-up. Occasionally they advise against diving for now, which is exactly the protection the process is designed to give. Either way, you go into the water knowing a professional has looked at the question.
Keep any signed statement somewhere safe and bring it to every dive operator — it saves repeating the whole process at each new center.
How to prepare so there are no surprises
- Read the standard diver medical questionnaire before you book, so you know if anything applies.
- If in doubt, see a doctor familiar with diving for clearance before you travel.
- Bring any signed medical-fitness statement with you to the dive center.
- Keep it current — a clearance from years ago may need refreshing.
- Tell your instructor about anything relevant; they'd much rather know.
A small cost that prevents a big one
A doctor's visit for dive clearance is a minor expense, but skipping it can cost you a whole course you've already paid for — or worse. We treat sensible medical preparation as part of the genuine cost of getting into diving.
Fitness ties directly to safety — read our plain explainer on decompression sickness for new divers and why dive insurance (DAN & more) matters. New to all this? Start with Discover Scuba vs Open Water.
Bottom line: the medical form is quick, and for most people it's a formality. But take it seriously, answer honestly, and if anything applies, get a doctor's clearance before you travel. A little preparation means you spend day one in the water — not in a waiting room.