What Happens If You Let A Sinus Infection Go Untreated?

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If sinus infection is left untreated and you are not under regular supervision of doctor then it can lead to dangerous and worsening conditions such as Meningitis, Cellulitis, Thrombosis, Osteomyelitis, Encephalitis or Abscess. In rare case sinus infection in the rear center of head can spread into brain causing redness, swelling around the eyes, reduced vision leading to blindness. An untreated sinus infection becomes much nastier and difficult to treat.