From Longman Dictionary of Contemporary Englishsinusitissi‧nus‧i‧tis /ˌsaɪnəˈsaɪtɪs/ noun [uncountable] a condition in which your sinuses swell up and become painful
Examples from the Corpus
sinusitis• They claim it can relieve migraine and sinusitis and not so surprising, remove ear wax.• Having a parched nose and throat may lower resistance to colds, croup, sinusitis and respiratory problems.• Headaches due to sinusitis are localized over the frontal or maxillary sinuses. 