When you have a runny nose, "brain fluid leaking" typically isn't the first thing that comes to mind.
The skull bone injury causes CSF to seep through the nose. Drainage of clear, watery fluid through one or both sides of the nose is the most typical sign of a CSF leak. When bending forward, tilting the head, or straining, this leaking can get worse.
Allergies and illnesses like the common cold and influenza are the most frequent causes of clear liquid pouring from the nose. Another cause of a persistent runny nose is vasomotor rhinitis, in which there is no obvious reason why the condition exists. A leaking nose can be caused by nasal polyps, migraines, foreign bodies, and, very rarely, certain tumors.
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