When drowning nose must not be inhaled, you can properly exhale. If you breathe in at this time, it will cause drowning to become more serious. When a patient is drowning, he or she should not panic excessively, but remain calm and perform self-rescue. You can inhale through the nose when swimming, but inhalation is most likely to cause choking. If choking, resolutely do not continue to inhale through the nose. After choking, you can open your mouth wide, and you can try to do deep breathing after the mouth is open. Even if a few mouthfuls of water enter the mouth, it does not matter because all the water in the digestive tract can be discharged by medical means, but it is difficult to discharge the wastewater choked through inhalation. And if you enter the waste water, there will be a serious drowning situation, you can do some exhalation at this time, but the exhalation should be as superficial as possible, not to do too violent exhalation.