Symptoms of oxygen poisoning include facial muscle twitching, autonomic nerve disorder, sensory abnormalities, coughing and so on. 1. Facial muscle twitching: patients with oxygen poisoning may have facial muscle twitching, numbness of the mouth and tongue, lip tremor and other symptoms. 2. Autonomic nerve disorder: In oxygen poisoning, patients may also experience symptoms of autonomic nerve disorder, such as palpitations (rapid heartbeat, often accompanied by panic), sweating, pallor, vomiting, nausea and other uncomfortable symptoms. 3. Sensory abnormalities: In oxygen intoxication, patients may also experience sensory abnormalities, including narrowing of the visual field and symptoms such as hallucinations of hearing, seeing and smelling. 4. Coughing: Patients with oxygen poisoning may also experience symptoms such as coughing, extreme fatigue, difficulty in breathing, and even hair loss. When the patient has the above symptoms, he should go to the hospital in time, clarify the cause of the disease and follow the doctor’s instructions for treatment.