Yes, people can sweat underwater, including while scuba diving. Sweat is part of the body’s normal temperature-control system. Water can make sweat less noticeable because it is washed away or trapped by clothing, so a diver may not realize they are overheating.
Why might a diver sweat?
Overheating can happen before a dive while wearing a wetsuit or drysuit on a warm boat or shore, during strenuous swimming, or when exposure protection is too warm for the conditions. Carrying equipment, climbing a ladder, and gearing up can also increase body heat.
Does sweating stop underwater?
No. The body can continue to produce sweat, but the way heat is transferred changes in water. Water conducts heat much more effectively than air, and a diver’s exposure suit affects heat transfer. The sensation of being wet is not a reliable indicator of how much you are sweating or whether you are overheating.
How to manage heat before diving
- Put on exposure protection as late as practical and as directed by the operator.
- Stay in shade when possible and avoid unnecessary exertion while fully suited.
- Drink fluids appropriately and follow the dive team’s preparation procedures.
- Choose exposure protection suitable for the water temperature and activity.
- Tell your buddy or instructor if you feel dizzy, nauseated, unusually weak, or overheated.
Can you become too cold after sweating?
Yes. Once activity decreases or you enter cooler water, damp clothing and the environment can contribute to discomfort and heat loss. Use suitable exposure protection and end the dive if you become unwell or cannot maintain safe performance.
When should you be concerned?
Heat illness can be serious. Confusion, fainting, severe weakness, or worsening symptoms require prompt attention. Do not enter the water if you feel unwell, and follow local emergency procedures if symptoms develop.
Bottom line
Sweating underwater is possible, even if you do not notice it. Manage heat during preparation, select appropriate exposure protection, and take symptoms seriously. For personal medical concerns, consult a qualified healthcare professional.
Why divers can sweat underwater
Yes, sweating can occur while scuba diving. Your body continues regulating temperature underwater, and exertion during entries, swimming against current, carrying equipment, or wearing thick exposure protection can generate heat. Water may remove heat efficiently, but a wetsuit or drysuit limits heat exchange and can trap warmth, especially while gearing up on a hot boat or beach.
Managing heat before a dive
Prepare equipment in the shade when possible, drink water regularly, and avoid unnecessary exertion in full exposure gear. Put on a suit close to the time you need it, while still allowing a proper buddy check and briefing. Follow the operator’s instructions and never skip safety checks because you feel hot. If you feel faint, nauseated, confused, or unusually weak, tell someone immediately and seek appropriate help.
Staying comfortable during and after diving
Choose exposure protection suitable for the water and planned activity, not simply the thickest suit available. Keep an eye on hydration and rest between dives. After surfacing, remove or loosen insulating layers when safe and permitted, and cool down gradually. Heat discomfort can distract you from monitoring gas, buoyancy, and your buddy, so treat it as a reason to pause rather than push through.