Nasal snot is not cerebrospinal fluid. The main component of nasal snot is water and a small amount of protein, as well as some dust and impurities in the air. The main components of cerebrospinal fluid are water, protein, chloride, sugar and other components, but there are no impurities or dust in cerebrospinal fluid. In addition, nasal mucus is sticky and may appear yellow or green in color if it is inflamed. The cerebrospinal fluid is mostly a cool, water-like secretion. Note also that if the nasal discharge usually appears under the stimulation of hot or cold air, or under the stimulation of the outside world, most of it is nasal mucus. Cerebrospinal fluid rhinorrhea, on the other hand, usually does not have any precipitating factors, or is a watery discharge that appears after trauma or surgery. For further clarification, a biochemical examination of the cerebrospinal fluid is required to further clarify the diagnosis.