What is the prevalence of Congenital Adrenal Hyperplasia (CAH)?

Congenital Adrenal Hyperplasia (CAH) is a group of rare, inherited disorders that affect the adrenal glands, with an estimated global incidence of classic CAH ranging from 1 in 10,000 to 1 in 20,000 live births. While recognized as a rare disease, the prevalence varies significantly by ethnicity and geographic region, often due to founder effects and specific genetic mutations.

How is the prevalence of Congenital Adrenal Hyperplasia (CAH) calculated?

Estimating the prevalence of Congenital Adrenal Hyperplasia (CAH) is challenging because it involves both classic (severe) and non-classic (milder) forms. Newborn screening programs in many countries have improved data collection, yet non-classic Congenital Adrenal Hyperplasia (CAH) is frequently underdiagnosed or misdiagnosed as other hormonal conditions, leading to an underestimation of total cases. On the DiseaseMaps.org platform, 81 members have identified themselves as living with Congenital Adrenal Hyperplasia (CAH), providing a valuable, real-world perspective on the daily management of this condition.

Are there geographic or ethnic variations in incidence?

Yes, the incidence of Congenital Adrenal Hyperplasia (CAH) is not uniform. Certain populations show higher carrier frequencies, leading to higher disease incidence. For instance:

• In Yupik Eskimos, the incidence of classic Congenital Adrenal Hyperplasia (CAH) has been reported as high as 1 in 280.


• In European populations, the incidence is generally cited between 1 in 14,000 and 1 in 16,000.


• Non-classic Congenital Adrenal Hyperplasia (CAH) is significantly more common, affecting approximately 1 in 200 to 1 in 1,000 people in the general population.

Who is most affected by this condition?

Congenital Adrenal Hyperplasia (CAH) is an autosomal recessive condition, meaning it affects males and females with equal frequency. However, the clinical presentation and diagnostic pathway often differ by sex, particularly regarding ambiguous genitalia in newborn females. While often diagnosed in the pediatric period via newborn screening or acute adrenal crisis, many individuals with non-classic Congenital Adrenal Hyperplasia (CAH) may not receive a diagnosis until adolescence or adulthood when they present with symptoms like precocious puberty, hirsutism, or infertility.

Next steps

• Consult a pediatric endocrinologist for specialized management of Congenital Adrenal Hyperplasia (CAH).


• Request genetic counseling to understand carrier status and family inheritance patterns.


• Join the DiseaseMaps.org community to connect with the 81 members currently sharing their experiences with this condition.

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

References

• NIH Genetic and Rare Diseases Information Center (GARD): Congenital Adrenal Hyperplasia.


• Orphanet: Congenital adrenal hyperplasia due to 21-hydroxylase deficiency.


• OMIM (Online Mendelian Inheritance in Man): 21-Hydroxylase Deficiency (#201910).


• The CARES Foundation: Congenital Adrenal Hyperplasia statistics and resources.