Recently, syphilis has become a major public health problem in Japan. We report seven cases of syphilis that were encountered in the otorhinolaryngology department at the Osaka Police Hospital over a period of one year and five months. Five of the seven patients were diagnosed as having pharyngeal syphilis. The butterfly appearance, one of the characteristic findings of pharyngeal syphilis, was found in two patients. Four patients had cervical lymphadenopathy, and three of them did not have any cervical tenderness. One of these four patients presented with only cervical lymphadenopathy, with no associated pharyngeal findings, and was diagnosed as a case of syphilitic cervical lymphadenopathy.Evidence of neurosyphilis was found in four of the seven patients. Vestibular dysfunction was found in two patients, and facial palsy in one. The findings of pharyngeal syphilis disappeared rapidly after treatment. Thus, as the condition is eminently treatable, otolaryngologists should make an early and appropriate diagnosis of syphilis. Proactive cerebrospinal fluid examination and neurological examinations may be needed to rule out the possibility of asymptomatic neurosyphilis.