23 September 2026

Dr Pathma A/P Letchumanan, Consultant Otorhinolaryngologist (ENT), Hospital Seri Botani Key Takeaways Sinusitis occurs when the lining of the sinuses becomes inflamed, causing swelling, blocked drainage and a build-up of mucus. The four pairs of sinuses – maxillary, frontal, ethmoid and sphenoid, are air-filled spaces around the nose, cheeks, eyes and forehead that help humidify