Contraindications: who shouldn't use a chamber

Why does contraindication screening matter for cosmetic HBOT?

HBOT is among the safest therapies in use, but that record depends entirely on screening patients before they enter a chamber. This is a specific concern in cosmetic settings: a hair clinic that has assessed a patient for surgical suitability has not necessarily assessed them for hyperbaric suitability, since those are different, separate assessments.

Hyperbaric oxygen therapy is a safe treatment when it is delivered to appropriately screened patients, and the standard review of its adverse effects describes it as among the safest therapies in use. That safety record rests on screening. The reason chamber medicine has a good safety profile is that people who should not be in a chamber are identified before they get in one.

This is a specific concern when HBOT is offered as a cosmetic add-on rather than as hospital treatment. A hair clinic booking chamber sessions for a patient it has assessed for surgical suitability has not necessarily assessed that patient for hyperbaric suitability. Those are different assessments.

What is the one absolute contraindication to hyperbaric oxygen therapy?

Untreated pneumothorax is the sole universally recognised absolute contraindication to HBOT. The risk is mechanical: a closed pocket of gas in the chest expands during decompression and, if it cannot vent, can cause a tension pneumothorax—an immediate emergency. A treated, resolved pneumothorax is different and requires the hyperbaric physician's individual assessment.

What relative contraindications require a hyperbaric physician's assessment before HBOT?

Ten relative contraindications require specialist review, not automatic exclusion: obstructive airway disease with air trapping, recent ear or sinus surgery, active respiratory infection or congestion, seizure disorder, certain chemotherapy agents, recent thoracic surgery, high fever, severe claustrophobia, pregnancy, and implanted devices like pacemakers—all decided by a hyperbaric physician, not a hair surgeon.

These are not automatic exclusions. They are reasons for a hyperbaric physician, not a hair surgeon, to make the decision.

• Obstructive airway disease with air trapping, including significant emphysema with bullae, because of the same gas-expansion problem in a smaller and more localised form.
• Recent ear or sinus surgery, or an inability to equalise middle ear pressure. Middle ear barotrauma is the most common adverse effect of HBOT, and existing ear pathology raises that risk substantially.
• Active upper respiratory infection or significant nasal congestion, which impairs equalisation and makes barotrauma much more likely. This is usually a reason to postpone rather than to exclude.
• Seizure disorder. Central nervous system oxygen toxicity can provoke seizures at hyperbaric oxygen doses, and an existing seizure threshold problem compounds that.
• Certain chemotherapy agents. Some cytotoxic drugs have recognised interactions with hyperbaric oxygen and require specific review.
• Recent thoracic surgery.
• High fever, which lowers the seizure threshold.
• Claustrophobia severe enough to prevent tolerating an enclosed chamber, which is a practical rather than a medical bar but ends the treatment just as effectively.
• Pregnancy, where hyperbaric exposure is reserved for specific emergency indications and would not be considered for an elective cosmetic adjunct.
• Implanted devices. Pacemakers, insulin pumps and other implanted hardware need to be checked for pressure rating individually.

How does contraindication screening intersect with hair transplant patients specifically?

Two overlaps matter: hair transplant patients are often young and healthy, tempting everyone to treat screening as a formality—exactly when undiagnosed lung disease or an unmentioned seizure history gets missed. Second, medications like Finasteride, Dutasteride or oral Minoxidil must be disclosed to the hyperbaric service, since reviewing them is its job, not the hair clinic's.

Two overlaps are worth naming.

The first is that hair transplant patients are often relatively young and healthy, which makes it easy for everyone involved to treat screening as a formality. It is not. A young healthy patient with undiagnosed bullous lung disease or an unmentioned seizure history is exactly the case screening exists to catch.

The second is medication. Many hair transplant patients are taking Finasteride, Dutasteride, oral Minoxidil or a combination, and some are on other medication for unrelated conditions. Those should be disclosed to the hyperbaric service, not just to the hair clinic — reviewing them is part of hyperbaric assessment, and the hair clinic is not the party doing that review.

What does thorough contraindication screening for HBOT look like?

Before a first session, expect questions on respiratory, ear/sinus, and seizure history, current medication including chemotherapy, implanted devices, pregnancy, and past difficulty with pressure changes like flying or diving—asked by hyperbaric-trained staff before you pay. If screening is just a tick-box on a cosmetic consent form, declining the add-on is reasonable.

Before a first session you should expect to be asked about respiratory history, ear and sinus history and current congestion, seizure history, current medication including chemotherapy, implanted devices, pregnancy where relevant, and any previous difficulty with pressure changes such as flying or diving.

You should be asked by someone with hyperbaric training, and the assessment should happen before you have paid for a course rather than on the day of the first session.

If the extent of the screening is a tick-box on a cosmetic consent form, the safety framework that produces hyperbaric medicine's good record is not in place. That is a reasonable ground to decline the add-on, and declining it costs you nothing that the published evidence has established.

Sources

1. Heyboer M, Sharma D, Santiago W, McCulloch N. Hyperbaric Oxygen Therapy: Side Effects Defined and Quantified. Advances in Wound Care, 2017;6(6):210-224. pubmed.ncbi.nlm.nih.gov/28616361
2. Thom SR. Hyperbaric oxygen: its mechanisms and efficacy. Plastic and Reconstructive Surgery, 2011;127 Suppl 1:131S-141S. pubmed.ncbi.nlm.nih.gov/21200283
3. Undersea and Hyperbaric Medical Society. Indications for Hyperbaric Oxygen Therapy (approved indications list). uhms.org/resources/hbo-indications.html
4. Fan Z, Gan Y, Qu Q, Wang J, Lunan Y, Liu B, Chen R, Hu Z, Miao Y. The effect of hyperbaric oxygen therapy combined with hair transplantation surgery for the treatment of alopecia. Journal of Cosmetic Dermatology, 2021;20(3):917-921. pubmed.ncbi.nlm.nih.gov/32770782

This article summarises published research and standard clinical practice. It is general educational information, not medical advice, and it does not replace the instructions your own surgical team gives you. Where their guidance differs from anything here, follow theirs.