Usually snorting snot into the stomach does not cause intracranial infections. However, if there is a nasal leak of cerebrospinal fluid, it is not recommended. Sucking snot up into the stomach enters the digestive system, passes from the esophagus through the stomach and intestines, and then exits, and does not cause intracranial infections. The cause of intracranial infections can be trauma to the brain or mosquito bites. If the head and face are traumatized, bacteria and toxins enter the bloodstream and then travel to the skull, causing an intracranial infection. Under normal circumstances, the body is not as susceptible to intracranial infections due to the blood-brain barrier. Once an intracranial infection occurs, it can lead to serious encephalitis or meningitis, and at this time, because of the existence of the blood-brain barrier, it is difficult for ordinary drugs to enter the brain to play a role, and in most cases it is difficult to save. However, if there is a cerebrospinal fluid nasal leak, doing similar actions may increase the risk of infection. Nasal snot into the digestive system, by the gastric fluid, intestinal fluids and other digestive fluids to sterilize, there is generally no problem. However, one needs to be wary of causing aspiration. Accidental choking can cause lung infections as it enters the lungs from the trachea. Patients should go to the hospital promptly when they experience discomfort.