Sinusitis is one of the inflammatory-infectious diseases with a lot of side effects. Until know there has been no overall estimate of the prevalence of sinusitis in Iran. The Purpose of this study is to estimate the prevalence of sinusitis in Iran using Meta-Analysis method. The search was done using keywords of Prevalence, Sinusitis, Iran in the foreign databases of Pub, Scopus, med, ISI, Google Scholar and native databases such as Sid, Medlib, Iran medex, Magiran. The data was analyzed using Meta-Analysis (Random Effects Model). The heterogeneity of the studies was investigated using the index. Data was analyzed using STATA Ver.11 software. Among the 12 studied articles with the sample size of 1057 people, the prevalence of sinusitis in Iran was 53% (confidence interval 95%: 40% to 65%). Also, the prevalence of sinusitis maxillary, ethmoid sinusitis, sphenoid sinusitis, frontal sinusitis, maxillary sinusitis and fungal sinusitis was 68%, 31%, 17%, 87% and 39%, respectively. Also, the prevalence of sinusitis in the west of the country is less compared to the others, and more in the center of the country. The prevalence of sinusitis in Iran is high and among them, maxillary and frontal sinusitis have the least prevalence, and most of the patients suffering from sinusitis show clinical symptoms of nasal discharge.
