Hyperbaric Oxygen Therapy for Wound Healing: How It Works and Who Qualifies

Hyperbaric oxygen therapy — commonly called HBOT — is one of the most advanced treatments available for complex, non-healing wounds. If you've been referred for HBOT, you may be wondering what it involves, whether it works, and whether you're a good candidate. This guide covers everything patients need to know.

What Is Hyperbaric Oxygen Therapy?

During HBOT, you breathe 100% pure oxygen inside a pressurized chamber — typically at 2 to 3 times normal atmospheric pressure. Under these conditions, your lungs absorb far more oxygen than they would at normal pressure. That oxygen dissolves into your blood plasma and reaches tissues that may have inadequate blood supply, flooding the wound environment with the oxygen needed for healing.

How HBOT Helps Wounds Heal

Oxygen is essential to nearly every aspect of wound healing — immune cell function, collagen production, new blood vessel formation, and resistance to infection. When a wound has inadequate oxygen (a condition called tissue hypoxia), healing stalls. HBOT addresses this directly by:

• Stimulating angiogenesis — the formation of new blood vessels in and around the wound
• Enhancing immune function — white blood cells need oxygen to kill bacteria
• Reducing swelling — high oxygen levels cause blood vessels to constrict slightly, reducing edema
• Fighting infection — high oxygen levels are toxic to many anaerobic bacteria
• Activating stem cells — HBOT mobilizes stem cells from bone marrow to support tissue repair

Which Wounds Does HBOT Treat?

HBOT is not appropriate for all wounds. Medicare and most insurers cover it for specific diagnoses when standard wound care has not been sufficient. FDA-cleared indications for wound-related HBOT include:

What Happens During an HBOT Session?

A typical HBOT session lasts 90 to 120 minutes. Here's what to expect:

Before your session: You'll change into a cotton gown (no synthetic fabrics, which can generate static). Remove all jewelry, hearing aids, and electronics. You cannot bring anything flammable into the chamber.

During pressurization: As the chamber pressurizes, you'll feel fullness in your ears — similar to descending in an airplane. You'll be taught to equalize pressure by swallowing, yawning, or performing the Valsalva maneuver. Most patients find this brief and manageable.

During the session: You breathe normally through a mask or hood. Many patients read, watch TV (some chambers have screens), or sleep. You may feel warmth as the chamber pressurizes — this is normal.

After depressurization: The chamber slowly returns to normal pressure. Some patients feel lightheaded briefly after sessions; this resolves quickly.

How Many HBOT Sessions Are Needed?

A standard course of HBOT for wound healing typically involves 30 to 40 sessions, delivered once daily, five days per week. This means treatment runs six to eight weeks. Your wound will be reassessed periodically to determine whether you're responding and whether the full course is warranted.

Who Is Not a Good Candidate for HBOT?

HBOT is safe for most patients but is not appropriate for everyone. Contraindications include:

• Untreated pneumothorax (collapsed lung) — absolute contraindication
• Certain chemotherapy drugs — some agents react adversely with high oxygen (discuss with your oncologist)
• Severe COPD — increased risk of oxygen toxicity
• Uncontrolled high fever
• Claustrophobia — though many patients adapt; anxiolytic medication can help
• Ear or sinus conditions that prevent pressure equalization

Your wound care provider will review your full medical history before recommending HBOT.

Does HBOT Work?

The evidence for HBOT in diabetic foot ulcers and radiation-damaged tissue is strong. Multiple randomized controlled trials have shown higher rates of wound closure and reduced amputation rates in diabetic patients who received HBOT compared to standard care alone. For other indications, evidence ranges from strong to moderate.

HBOT works best as part of a comprehensive wound care program — not as a standalone treatment. It should be combined with regular debridement, appropriate dressings, offloading (for foot wounds), and optimization of underlying conditions like diabetes and vascular disease.

Is HBOT Covered by Insurance?

Medicare covers HBOT for approved indications when standard wound care has failed. Most private insurers follow Medicare guidelines. Prior authorization is typically required. Your wound care center will handle the authorization process and communicate with your insurer before treatment begins.

Recommended Wound Care Supplies

These products are commonly recommended by wound care specialists for home wound management:

• Wound care dressings on Amazon — Wide selection of professional wound dressings
• Wound care kits on Amazon — Complete kits for home wound management
• Vitality Medical — Professional Wound Care Supplies — Professional-grade dressings and medical supplies
• AllDiabetic — Medical Supplies — Medical supplies at low out-of-pocket prices

Disclosure: This post contains affiliate links. WoundCareLocator.com may earn a small commission at no extra cost to you.

The Bottom Line

Hyperbaric oxygen therapy is a powerful tool for wounds that have stopped responding to conventional treatment. If you have a diabetic foot ulcer, a radiation wound, or another qualifying condition that hasn't improved with standard care, HBOT may be the intervention that makes healing possible. Talk to your wound care provider about whether you're a candidate.