A rusty smell inside a patient’s nose is not necessarily related to a brain tumor. The rusty smell inside the nose may be due to the patient’s ruptured nasal mucosa or ruptured arterial blood vessels causing nasal bleeding, after which there is blood stored in the nasal cavity, and the stale blood often has a rusty smell. When the patient blows his nose hard, the old black blood may drain outward along with the nasal discharge. In terms of treatment, patients should go to the hospital for a detailed examination to clarify the specific situation in the nasal cavity, which can be perfected by nasal endoscopy or CT of the nose. if there is rhinitis, it should be actively treated, and if there is rupture of the nasal mucosa, you can apply compound peppermint brain nasal drops oil, which can play a moisturizing role. If the patient usually has discomfort in the brain, try to improve the CT of the head to clarify the diagnosis.