Hyperbaric oxygen therapy (HBOT) is generally well-tolerated, with most people experiencing mild to no side effects. However, like all medical treatments, it carries some risks. Common side effects include lightheadedness, which usually lasts only a few minutes after the session. Some people may experience vision changes due to pressure changes in the eye, but these changes typically revert within 6 to 8 weeks. Claustrophobia can be an issue for some, but newer clear acrylic chambers help alleviate this. If you feel anxious, inform your clinician, who may prescribe medication to help you relax. Sessions last about 2 hours, and a healthcare professional is always present. Ear pressure changes, similar to those felt during an airplane descent, are common and can be managed by swallowing or chewing. Rarely, this can lead to middle ear trauma or sinus pain. Tooth pain, known as 'tooth squeeze,' can occur if there are air pockets in the tooth, often due to recent dental work. Pulmonary symptoms are rare but can include lung overinflation or oxygen toxicity, which can be serious. Always consult your doctor if side effects persist or affect your quality of life. People with diabetes should monitor their blood sugar levels during treatment. Ensure your treatment center is certified by the Undersea and Hyperbaric Medicine Society to minimize risks.