Yes, it is possible for too much hyperbaric oxygen to lead to oxygen poisoning. Oxygen poisoning, also known as hyperoxia, occurs when the body is exposed to high levels of oxygen for an extended period of time. Symptoms of oxygen poisoning may include dizziness, headache, nausea, and shortness of breath. In severe cases, oxygen poisoning can lead to seizures, coma, and even death. It is important to carefully follow the guidelines and recommendations of a medical professional when undergoing hyperbaric oxygen therapy to avoid the risk of oxygen poisoning.