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Nasal discharge refers to fluid that comes from the nose, and originates in the nasal passages. This fluid may be clear, blood-tinged, bloody, or it may contain mucus (mucoid discharge) or pus (purulent discharge). In some instances, the nasal discharge may contain food particles. The nasal discharge may originate from one nostril (unilateral) or from both nostrils (bilateral).
Mucoid, mucopurulent or purulent sputum is thicker and often more sticky than normal sputum. This is partly due to the greater mucus production coupled with pus in the purulent types. Apart from the consistency, the color of purulent sputum may vary from white or gray to yellow, green, rust-colored or brown. It may also have a pink tinge (blood streaked) which may be due to a small quantity of blood.