Clear fluid from your nose after activity can be terrifying. Most people immediately think “CSF leak.” But here’s something most don’t realize… Sometimes it’s not your brain — it’s your blood flow. Venous congestion inside the nasal cavity can cause clear drainage, one-sided nosebleeds, pressure, ringing in the ears, and that “full head” feeling — especially after stairs, exercise, or neck movement. This often points to dysregulation in the sympathetic nervous system and impaired venous drainage

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