We report on 2 patients with catamenial pneumothorax and one patient with catamenial hemoptysis. The pathogenesis of these diseases is not clear, and intrathoracic endometriosis is often assumed. Catamenial pneumothorax is rare and differs from primary spontaneous pneumothorax in its prevalence in the fourth decade and in mainly multiparous women, its recurrent and almost exclusively right-sided occurrence within 72 hours of the beginning of menstruation, and the generally small size of the pneumothorax. About 5% of women under 50 presenting with primary pneumothorax have catamenial pneumothorax. Prevention of recurrence is difficult, as the recurrence rate is high, treatment duration is potentially long, and residual thoracic pain during menstruation is sometimes seen. The combination of medication (Gn-RH analogues, danazol, possibly hormonal contraceptive drugs or progestagens) with efficient pleurodesis (e.g. thoracoscopic talc application preferentially performed during menstruation) seems so far to be the most efficient, although no controlled studies have yet been performed. Catamenial hemoptysis is very rare and hormonal treatment alone is frequently successful in the long term. In the event of relapse, resection of the implicated endometriotic or angiomatous lesion localized by computed tomography can be performed.