Mild gas poisoning is also known as mild carbon monoxide poisoning, how long it takes to recover depends on the patient’s individual physical condition and treatment, and requires comprehensive analysis, not a generalization. In mild gas poisoning, patients may experience dizziness, headache, ringing in the ears, nausea, weakness and lethargy, etc. If detected in time, and the patient is moved to a ventilated place, inhaled fresh air, and given oxygen treatment in time, patients with better health can usually recover completely after a few hours or within 3-5 days. However, if the patient is older or has other underlying physical diseases, other symptoms may be induced in the absence of oxygen, and it usually takes 1-2 weeks to get better. If the patient fails to leave the poisoned environment in time, resulting in severe lack of oxygen to the brain and untimely treatment, he or she may be left with symptoms such as memory loss and headache, and the recovery time is relatively long. It is especially important for gas poisoning patients to leave the poisoned environment in time, and if the symptoms are severe, they need to go to the hospital emergency room for hyperbaric oxygen chamber treatment in time, and if necessary, they can take drugs that activate blood circulation and nourish brain cells.