Can a Sinus Infection Spread to the Brain?
Yes. In rare cases, bacteria or fungi from a sinus infection can spread to the brain. This may cause meningitis, a brain abscess, or other serious complications. The infection usually travels through direct bone erosion, venous pathways, or via the olfactory nerve.
What Causes a Brain Infection from Sinusitis?
Untreated or severe bacterial sinusitis is the most common cause. Fungal sinusitis, especially in people with weakened immunity, can also spread. Risk increases with chronic sinusitis, nasal polyps, recent sinus surgery, or dental infections near the sinuses.
When to Seek Emergency Care
Seek immediate medical help if you have a sinus infection with high fever, severe headache, confusion, vision changes, neck stiffness, or seizures. Early diagnosis and treatment with antibiotics or surgery can prevent lasting damage. For more information on sinus complications, see the Mayo Clinic sinusitis overview.
