Decompression Sickness: Why Recompression Is the Definitive Treatment
For decompression sickness, recompression with oxygen in a hyperbaric chamber is the definitive treatment. DAN guidance and why chamber networks matter for divers.
- For decompression sickness, recompression with oxygen in a hyperbaric chamber is the established, definitive treatment and sits on recognized indication lists.
- DAN advises a diver with serious symptoms be given 100 percent surface oxygen and evacuated, contacting emergency services first, then DAN for specialist consultation.
- Increasing chamber pressure shrinks the gas bubbles while breathing high-concentration oxygen speeds elimination of the excess inert gas.
What decompression sickness is
Decompression sickness, often called the bends, occurs when a diver ascends and dissolved inert gas, mainly nitrogen, comes out of solution and forms bubbles in the blood and tissues. Depending on where the bubbles lodge, symptoms range from joint pain and skin changes to dizziness, weakness, breathing difficulty, and neurological problems. Divers Alert Network (DAN) describes it as a genuine medical emergency when serious signs appear.
Unlike most hyperbaric indications, this one is not a matter of debate over evidence. Recompression is the established, definitive treatment.
First aid and getting help
DAN guidance is consistent on the immediate steps. A diver with serious symptoms should be given 100 percent oxygen at the surface and evacuated to the nearest medical facility. The recommended sequence is to contact emergency medical services first, then contact DAN for specialist consultation on transport and treatment. A profoundly dizzy, weak, or barely conscious diver requires urgent evacuation, and stabilization at the nearest facility comes before transfer to a chamber.
Early treatment is repeatedly linked to better recovery, so delays should be minimized even though recompression can still help after some hours have passed.
Surface oxygen matters even before a chamber is reached. Breathing 100 percent oxygen at the surface helps wash inert gas out of the tissues and can ease symptoms during transport, which is why DAN emphasizes having oxygen available as part of dive first aid. It is a bridge to definitive care, not a substitute for it.
The definitive treatment
The definitive management is recompression and oxygen administration in a hyperbaric chamber. Increasing the surrounding pressure shrinks the gas bubbles and helps the excess gas dissolve and wash out, while breathing high-concentration oxygen speeds elimination. This is why decompression sickness sits on the recognized indication lists maintained by bodies such as the Undersea and Hyperbaric Medical Society, alongside other acute conditions.
Treatment follows established protocols delivered by trained hyperbaric teams, not improvised at the dive site. Recompression schedules are standardized, and a treating physician selects the protocol based on the diver's symptoms and response. Attempting to recompress in the water is widely discouraged outside of specific, expert-supervised circumstances because of the risks involved.
Why chamber networks matter
For divers, access is a practical problem. DAN maintains information on recompression chamber availability because a suitable chamber may be far from a dive site, and coverage for injured divers has become less certain in some regions. Knowing that an emergency-capable facility exists within reach is part of dive planning, not an afterthought.
Recompression for divers is typically delivered in larger room-style units that can accommodate an attendant and treat under supervision, and readers can review how these systems work at multiplace chambers. That is a very different context from personal wellness devices.
If you or a dive buddy shows possible signs of decompression sickness, treat it as an emergency, start surface oxygen if available, and let emergency and diving-medicine physicians direct recompression rather than attempting to self-manage.
Frequently asked questions
+What is the definitive treatment for decompression sickness?
Recompression and oxygen administration in a hyperbaric chamber is the definitive management. Increasing the surrounding pressure shrinks the gas bubbles and helps the excess gas dissolve and wash out, while breathing high-concentration oxygen speeds elimination. Unlike most hyperbaric indications, this is not debated - recompression is the established treatment, delivered by trained hyperbaric teams under standardized protocols.
+What first aid should a diver with the bends receive?
DAN guidance is to give a diver with serious symptoms 100 percent oxygen at the surface and evacuate to the nearest facility, contacting emergency medical services first, then DAN for specialist consultation on transport and treatment. Surface oxygen helps wash inert gas from the tissues and is a bridge to definitive care, not a substitute. Treat possible signs as an emergency.
+Why does chamber access matter for divers?
A suitable chamber may be far from a dive site, and DAN notes coverage for injured divers has become less certain in some regions, so knowing an emergency-capable facility is within reach is part of dive planning. Early treatment is repeatedly linked to better recovery, so delays should be minimized. Recompression is typically delivered in larger room-style units that can accommodate an attendant.