Bloody sinus discharge, especially if it comes from only one nostril and is accompanied by face pain or tenderness, is a cause for concern, says The Merck Manual Home Edition. Someone experiencing these symptoms should see a doctor.
Bloody discharge from only one side of the nose, with accompanying face pain, may be symptomatic of acute sinusitis, according to The Merck Manual Home Edition. When bloody sinus discharge occurs in children, it is sometimes accompanied by a foul smell. In these cases, doctors often check for a foreign object lodged in the nose. Most sinus discharge is the result of allergies and the common cold.