A diving trip can be disrupted by more than bad weather. Ear pressure that will not equalize, uncontrolled asthma symptoms, a new medication, or a recent surgery can change whether it is safe to enter the water. This diving physical requirements guide explains what a diving medical evaluation may cover, who may need one, and how to prepare before your next recreational or professional dive.
A physical is not simply a formality. Diving places your body under increased pressure, requires controlled breathing, and can put you far from immediate medical help. The right clearance process helps identify concerns early, so you can address them before they become a problem offshore or underwater.
Who Needs a Diving Physical?
The answer depends on the type of diving you plan to do and the requirements of your training agency, employer, vessel operator, or dive charter. Many recreational divers complete a health questionnaire first. If they answer yes to certain questions, a medical evaluation and signed clearance may be required before training or diving.
A formal diving physical is more commonly requested for commercial divers, public safety divers, professional maritime workers, instructors, and divers whose employer has occupational health standards. Some programs also require periodic exams, even when the diver has no known health concern.
Even if no one requires paperwork, an evaluation is a sensible step if you have had a major illness, surgery, hospitalization, injury, or meaningful change in your health since your last dive. The safest decision is sometimes to postpone diving until you have been evaluated and your condition is stable.
What Diving Physical Requirements Usually Evaluate
A provider uses the physical to look for conditions that could affect breathing, pressure equalization, alertness, mobility, circulation, or the ability to respond to an emergency. Requirements differ by organization, but the exam usually begins with your medical history and a review of current medications.
Your clinician may check your blood pressure, pulse, heart and lung function, ears, nose, throat, vision, and general neurological and musculoskeletal health. Depending on your history and the form required, additional testing such as a urinalysis, lab work, EKG, vision testing, hearing testing, chest imaging, or pulmonary function testing may be requested.
The goal is not to exclude people unnecessarily. It is to determine whether a condition needs treatment, further testing, a specialist opinion, activity limits, or a temporary delay before diving. A healthy diver may need only a straightforward examination, while someone with a more complex history may need additional documentation.
Breathing and Lung Health
Because compressed gas breathing and pressure changes affect the lungs, respiratory health receives close attention. Asthma, chronic obstructive pulmonary disease, a history of spontaneous collapsed lung, frequent wheezing, or recent chest infection can require further review.
Having asthma does not always mean a person can never dive. The details matter: how well symptoms are controlled, whether exercise or cold air triggers them, how often rescue medication is needed, and whether lung testing is normal. A diver should not use a medical clearance as permission to enter the water while actively coughing, wheezing, short of breath, or sick with a respiratory infection.
Heart, Blood Pressure, and Circulation
Diving can place added demands on the heart and circulation, especially during surface swims, current, cold water, or emergency exertion. A history of chest pain, heart attack, irregular heartbeat, heart failure, stroke, fainting, uncontrolled high blood pressure, or blood clots needs careful medical review.
Medication alone does not automatically prevent diving. What matters is the underlying condition, whether it is stable, and whether a medication causes side effects such as dizziness, dehydration, drowsiness, or reduced exercise tolerance. Your evaluator may recommend follow-up with your primary care clinician or a specialist before signing a clearance form.
Ears, Sinuses, and Equalization
Divers must be able to equalize pressure in the ears and sinuses. Ear infections, sinus infections, severe seasonal allergies, nasal blockage, recent ear surgery, eardrum problems, hearing changes, or repeated difficulty clearing the ears can make diving painful and unsafe.
Do not try to force equalization. Pain, vertigo, sudden hearing loss, or drainage from an ear during or after a dive should be evaluated promptly. Decongestants may temporarily reduce congestion for some people, but they can wear off during a dive or cause side effects. They are not a substitute for being well enough to dive.
Neurological Health and Mental Readiness
A history of seizures, unexplained loss of consciousness, severe migraines with neurological symptoms, brain injury, or conditions affecting balance and coordination may require more detailed review. The concern is whether a sudden episode could occur underwater or whether a condition could interfere with judgment and emergency response.
Mental health also deserves an honest conversation. Anxiety, panic symptoms, depression, sleep problems, and medication changes can affect comfort and decision-making in the water. Many people with well-managed mental health conditions can participate safely, but stability and medication effects should be considered before a dive.
Mobility, Strength, and Recent Injuries
Diving gear is heavy, boat ladders can be demanding, and changing conditions may require quick movement. Back pain, joint injuries, limited shoulder motion, poor balance, or recent orthopedic surgery may affect your ability to carry equipment, climb a ladder, manage fins, or assist a buddy.
A provider may clear you for diving with practical restrictions, such as avoiding strenuous shore entries or heavy gear carrying while you recover. Be realistic about the whole activity, not only the time spent underwater.
When to Delay a Dive
A new illness is often a reason to wait, even if it seems minor. Cold and flu symptoms, fever, chest congestion, vomiting, diarrhea, dehydration, and significant fatigue can affect breathing, equalization, hydration, and stamina.
You should also seek medical guidance after surgery, a hospital stay, a serious injury, or a new diagnosis. Return-to-diving timing varies widely based on the procedure and recovery. A person recovering from a simple issue may return relatively soon, while another may need a longer recovery period and specialist clearance.
If you experience severe shortness of breath, chest pain, confusion, weakness on one side of the body, fainting, or severe symptoms after diving, seek emergency care. These are not symptoms to manage through a routine physical.
How to Prepare for Your Diving Physical
Bring the required form from your employer, training organization, or dive operator. Forms are not interchangeable, and the provider needs to know exactly what standards or sections must be completed.
Come prepared with a list of medications, allergies, past surgeries, major diagnoses, prior diving injuries, and the date of your last physical. If you have records from a cardiologist, pulmonologist, ear specialist, or other treating clinician, bring relevant information. This can prevent delays if the examiner needs confirmation that a condition is stable.
Be specific about the type of diving you expect to do. Recreational reef diving, deep diving, commercial diving, public safety work, and frequent cold-water diving do not place identical demands on the body. Clear information helps the provider make an appropriate recommendation rather than a one-size-fits-all decision.
Get Your Clearance Before Travel Day
Avoid scheduling your evaluation at the last minute. If the exam identifies a need for testing, treatment, or specialist review, you will have time to complete those steps without losing a planned trip or work assignment.
Express Care of Tampa Bay provides diving physicals for local divers and workers who need prompt, practical evaluation. Walk-Ins Welcome, and No Appointment Needed for many services. Bring your required paperwork and any relevant medical information so the visit can stay focused and efficient.
The best time to address a diving health question is before the boat leaves the dock. A clear, honest medical evaluation gives you a better chance to enjoy the water with confidence and make sound decisions if your health changes.