Cerebrospinal fluid nasal leak is a steady drip of the clear fluid that cushions the brain, escaping through the nose. A tiny crack in the lining high inside the skull turns a runny nose into a medical clue. The first sign is clear, watery fluid that keeps coming from one nostril. It feels like a cold that never progresses—no color, no thick mucus, just a constant drip you dab away all day. The leak speeds up when you lean forward. You tie your shoes and a warm stream reaches the upper lip, or you shout across the yard and feel... Learn more