What is the prevalence of Catamenial Pneumothorax?

Catamenial pneumothorax is a rare condition characterized by recurrent, spontaneous lung collapse occurring in temporal association with the menstrual cycle. While exact global prevalence remains unknown due to significant underdiagnosis, it is estimated to account for 3% to 6% of all spontaneous pneumothorax cases in women of reproductive age, most commonly associated with thoracic endometriosis.

Is Catamenial Pneumothorax considered rare?

Yes, Catamenial pneumothorax is classified as a rare medical entity. Because it is frequently misdiagnosed as primary spontaneous pneumothorax or other respiratory issues, the true prevalence is likely higher than current clinical literature suggests. In our own DiseaseMaps.org community, 21 people with Catamenial pneumothorax have shared their experiences, highlighting that while the condition is rare, patients often seek specialized support to navigate their diagnostic journey.

Who is most affected by Catamenial Pneumothorax?

Catamenial pneumothorax exclusively affects biological females, typically between the ages of 25 and 45. There is no evidence of specific geographic or ethnic predispositions, though the condition is inherently linked to the presence of endometrial tissue outside the uterus. Key demographic and clinical factors include:

• Age of onset: Most frequently diagnosed in the third and fourth decades of life.


• Associated conditions: A high percentage of patients with Catamenial pneumothorax also exhibit signs of pelvic endometriosis.


• Diagnostic delay: The average time to receive an accurate diagnosis can take several years due to the cyclical nature of symptoms.

Why is prevalence data for Catamenial Pneumothorax difficult to track?

Accurate epidemiological data for Catamenial pneumothorax is hindered by the lack of a centralized registry and the high rate of clinical misdiagnosis. Many medical providers treat the pneumothorax without identifying the underlying hormonal or endometrial trigger. As awareness grows, clinical reporting of Catamenial pneumothorax is increasing, but current statistics should be viewed as estimates rather than definitive population counts.

Next steps

• Consult a thoracic surgeon or a pulmonologist familiar with thoracic endometriosis.


• Maintain a symptom diary that tracks the timing of chest pain or shortness of breath relative to your menstrual cycle.


• Join the Catamenial pneumothorax group on DiseaseMaps.org to connect with others who have navigated similar diagnostic paths.


• Request a referral to a center specializing in endometriosis or reproductive immunology.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of a qualified physician regarding any medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD)


• Orphanet: Portal for rare diseases and orphan drugs


• PubMed: Analysis of thoracic endometriosis and catamenial pneumothorax trends


• The Endometriosis Foundation of America