Hyperbaric wound care is a treatment that uses pure oxygen delivered at higher-than-normal air pressure to help heal stubborn or complex wounds. You sit or lie inside a sealed chamber where the air pressure is raised to about 2.4 times the normal atmospheric level, allowing your lungs to take in far more oxygen than they could under everyday conditions. That oxygen-rich blood then reaches damaged tissues that have been struggling to heal, jumpstarting several repair processes at once. It’s most commonly used for wounds that haven’t responded to standard treatment, particularly diabetic foot ulcers, radiation-damaged tissue, and deep bone or soft tissue infections.
How Pressurized Oxygen Heals Wounds
Wound healing is an oxygen-hungry process. Your body needs oxygen to build collagen, the structural protein that forms the scaffold of new tissue. Specifically, oxygen is required to modify the amino acids in collagen so the fibers can cross-link and mature into strong, durable tissue. When a wound isn’t getting enough oxygen, whether from poor circulation, diabetes, or radiation damage, collagen production stalls and the wound stays open.
Hyperbaric oxygen therapy (HBOT) corrects this by flooding the blood with dissolved oxygen, pushing it deep into tissues that normal circulation can’t adequately supply. This triggers a cascade of healing responses. Fibroblasts, the cells responsible for building new tissue, multiply faster. New blood vessels begin forming in the wound bed through a process called angiogenesis. The therapy actually works by creating a steep oxygen gradient between the center and edges of the wound, which is one of the strongest signals the body uses to grow new capillaries. At the same time, HBOT stimulates the release of growth factors, particularly one called vascular endothelial growth factor, that further accelerate blood vessel formation.
Beyond tissue repair, the high-oxygen environment narrows blood vessels slightly, which reduces swelling without cutting off oxygen delivery. It also supercharges white blood cells, improving their ability to kill bacteria through oxygen-dependent mechanisms.
Fighting Infection in Chronic Wounds
Many of the wounds treated with hyperbaric therapy are complicated by infection, and the oxygen-rich environment works against bacteria in several ways. Some dangerous bacteria, particularly the anaerobic species responsible for necrotizing fasciitis (flesh-eating disease) and gas gangrene, cannot survive in high-oxygen conditions. HBOT directly kills these organisms.
For other types of bacteria, the therapy strengthens your immune system’s ability to destroy them. White blood cells rely on oxygen to generate the reactive molecules they use to kill microbes, so in oxygen-starved tissue, immune defenses are weakened. Restoring oxygen levels gives your immune cells the fuel they need. HBOT also enhances the effectiveness of certain antibiotics, creating a synergistic effect where the combination works better than either treatment alone. This is why it has become a standard part of treatment for deep, chronic infections including osteomyelitis (bone infection), chronic soft tissue infections, and diabetic foot infections.
Which Wounds Qualify for Treatment
Hyperbaric wound care isn’t used as a first-line treatment. It’s typically reserved for wounds that have failed to improve with conventional care. The conditions most commonly treated include:
- Diabetic foot ulcers that haven’t healed despite proper wound management and blood sugar control
- Radiation tissue damage, including wounds and bone injury caused by prior radiation therapy for cancer
- Bone and tissue infections that cause tissue death, particularly osteomyelitis and necrotizing soft tissue infections
- Compromised skin grafts and flaps that aren’t getting adequate blood flow
- Crush injuries and other acute traumatic wounds with significant tissue damage
Insurance coverage, including Medicare, generally requires that the wound meet specific criteria and that conventional treatments have been tried first.
Evidence for Diabetic Foot Ulcers
Diabetic foot ulcers are one of the most studied applications of hyperbaric wound care, and the results are encouraging though not uniform. A systematic review of clinical outcomes found that across several trials, about 50% of patients receiving HBOT achieved complete ulcer healing compared to 29% in groups receiving only conventional therapy. Some individual studies reported even higher rates: one trial found 78% complete healing in the HBOT group.
The therapy also appears to help save limbs. One analysis found a 13% improvement in limb preservation and a 26% absolute reduction in the risk of amputation among patients receiving HBOT. However, not every study has found significant benefits. One trial found no meaningful difference in amputation rates between HBOT and standard care (51% vs. 48%). The variation likely reflects differences in patient selection, ulcer severity, and how far the disease had progressed before treatment began. HBOT tends to work best when there’s still enough blood flow to deliver the extra oxygen to the wound area.
What a Treatment Session Looks Like
A typical course of hyperbaric wound care involves around 33 sessions, though this can be extended if the wound is responding but not yet healed. Each session lasts about two hours and is conducted daily, usually five days a week. During treatment, the chamber is pressurized to 2.4 atmospheres absolute while you breathe 100% oxygen. Two 10-minute breaks from the oxygen mask are built into each session to prevent oxygen-related side effects.
There are two types of chambers. Monoplace chambers are built for one person. You lie down inside a clear acrylic tube, and the entire chamber fills with oxygen. These are the most common type in outpatient wound care centers. Multiplace chambers are larger rooms that can hold several patients at once, along with a medical attendant. In these chambers, you breathe oxygen through a mask or hood while the room itself is pressurized with regular air. Multiplace chambers allow medical staff to be physically present and are better suited for patients who need intensive monitoring or ongoing medical support during treatment.
Before entering the chamber, you’ll change into cotton clothing provided by the facility. Items that could create static electricity or pose a fire risk in a pure oxygen environment are prohibited. This includes wool and synthetic fabrics, electronics, lighters, and petroleum-based skin products like certain lotions or lip balm. The high-oxygen environment makes fire safety a serious concern, and facilities follow strict protocols guided by FDA recommendations.
Side Effects and Risks
The most common side effect is middle ear barotrauma, the same kind of ear pressure discomfort you might feel on an airplane but more pronounced. The rapid pressure changes can cause pain, a feeling of fullness, or temporary hearing changes. Most people learn techniques to equalize the pressure, similar to swallowing or yawning during a flight, and the issue resolves on its own.
Some patients develop temporary nearsightedness (myopia) during a course of treatment. This happens because the high-oxygen environment can cause slight changes in the shape of the lens inside the eye. Vision typically returns to normal within weeks to months after treatment ends.
Oxygen toxicity is a more serious but rare concern. Breathing pure oxygen at high pressure for too long can, in rare cases, trigger seizures. The 10-minute oxygen breaks built into every session are specifically designed to prevent this. Lung irritation from prolonged oxygen exposure is also possible over many sessions but is uncommon at standard treatment protocols.
The only condition that absolutely rules out HBOT is an untreated pneumothorax (collapsed lung). Changing the pressure inside the chamber could turn a small air leak into a life-threatening emergency. Patients with this condition must have it treated before starting hyperbaric therapy.
What to Expect Over a Full Course
Results from hyperbaric wound care aren’t immediate. The biological processes it stimulates, new blood vessel growth, collagen maturation, and infection control, unfold over weeks. Most patients begin to see measurable improvement in wound size and tissue quality after 15 to 20 sessions, though some wounds respond faster. Your wound care team will evaluate progress periodically and adjust the treatment plan, extending sessions beyond the standard 33 if the wound is still actively improving.
Hyperbaric therapy is always used alongside conventional wound care, not as a replacement. You’ll still need regular wound dressings, infection management, blood sugar control (for diabetic ulcers), and offloading pressure from the wound site. The oxygen therapy addresses the underlying biological barriers to healing while standard care manages the wound itself. The combination is what gives chronic, non-healing wounds the best chance of closing.