The length of hyperbaric oxygen treatment for carbon monoxide poisoning is not generalizable and should be decided on a patient-by-patient basis. Mild carbon monoxide poisoning is usually treated for 3 to 5 days; more severe poisoning may take a month or even longer. In the case of mild carbon monoxide poisoning, for example, if the patient suffers from mild dizziness, weakness, shortness of breath, etc., hyperbaric oxygen therapy for 3~5 days is usually carried out, which can bring about significant relief of the above symptoms. When the patient’s symptoms have significantly improved or disappeared, there is no need to continue hyperbaric oxygen therapy. If the degree of carbon monoxide poisoning is more serious and the patient has obvious symptoms such as blurred consciousness, nausea, vomiting, etc., the need for hyperbaric oxygen therapy is relatively longer. As to how long hyperbaric oxygen therapy is needed, it should be determined according to the patient’s clinical manifestations, and it may take one month or even longer. When carbon monoxide poisoning occurs, it should be taken seriously, sent to the doctor in time, and actively cooperate with the doctor for treatment and conditioning.