The analysis of 138 case records of acute mastoiditis (AM) patients treated for the last 5 years has demonstrated that mastoiditis incidence grows, it shows the trend to arise shortly after development of acute otitis media, classic symptoms occur less frequently while such symptoms as pain in the ear, pulse reflex, hypoacusis, elevated ESR are apparent. Most of the patients (71.7%) have undergone resection of the mastoid process. The resultant large retroauricular wound slowly granulated.