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PubMed This is a summary of 104 peer-reviewed journal articles Updated
Endocrinology

A Comprehensive Guide to Congenital Adrenal Hyperplasia (CAH)

At a Glance

Congenital Adrenal Hyperplasia (CAH) is a manageable genetic condition where the adrenal glands cannot produce enough cortisol and aldosterone. With proper daily hormone replacement therapy, individuals with CAH can live full, healthy, and active lives.

Welcome to this comprehensive resource guide on Congenital Adrenal Hyperplasia (CAH). A diagnosis of CAH can feel overwhelming, whether it involves a newborn child or your own health later in life [1].

CAH is a group of genetic conditions that affect the adrenal glands, the organs responsible for producing essential hormones like cortisol (the body’s stress hormone) and aldosterone (which balances salt and water) [2]. Because the adrenal glands lack a specific enzyme—most commonly 21-hydroxylase—they struggle to make these critical hormones and instead overproduce male-type hormones called androgens [3][4].

While CAH is a lifelong condition, it is highly manageable. Modern medicine offers targeted hormone replacement therapies that can restore this delicate balance, allowing individuals with CAH to lead full, active, and healthy lives [1][5].

This guide is designed to translate the complex biology, genetics, and daily management of CAH into clear, empowering information. It is not meant to replace professional medical advice, but rather to prepare you for productive conversations with your endocrinologist and care team.

Navigating This Guide

Please explore the following pages to better understand the specific facets of CAH:

01

The Biology of Congenital Adrenal Hyperplasia

Learn about the biology of congenital adrenal hyperplasia (CAH). Understand 21-hydroxylase deficiency, cortisol shortage, and how hormone imbalances occur.

02

The Types of CAH: Classic vs. Non-Classic

Learn the differences between the types of Congenital Adrenal Hyperplasia (CAH). Understand Classic Salt-Wasting, Simple Virilizing, and Non-Classic CAH.

03

Understanding Your Test Results: Screening and Genetics

Learn how to understand your Congenital Adrenal Hyperplasia (CAH) test results. We explain newborn screening, 17-OHP levels, ACTH tests, and CYP21A2 genetics.

04

Daily Treatment and Stress Dosing for CAH

Learn how to manage Congenital Adrenal Hyperplasia. Understand daily hydrocortisone treatment, when to stress dose, and how to use an emergency injection kit.

05

Navigating Non-Classic CAH (NC-CAH)

Learn about Non-Classic Congenital Adrenal Hyperplasia (NC-CAH). Understand why it mimics PCOS, common symptoms like hirsutism, and tailored treatment options.

06

Growing Up with CAH: Monitoring and Health

Learn about long-term health monitoring for Congenital Adrenal Hyperplasia (CAH). Understand medication balance, TARTs screening, and adult care transition.

Common questions in this guide

What causes Congenital Adrenal Hyperplasia?
CAH is caused by inherited genetic changes that affect the adrenal glands. The most common cause is a missing enzyme called 21-hydroxylase, which prevents the body from making enough essential hormones like cortisol.
Can someone with CAH live a normal life?
Yes, while CAH is a lifelong genetic condition, it is highly manageable. With targeted hormone replacement therapies and regular monitoring by an endocrinologist, individuals can successfully manage their health and lead active lives.
What is the difference between Classic and Non-Classic CAH?
Classic CAH is the more severe form and requires careful daily management and stress dosing to prevent adrenal crises. Non-Classic CAH is a milder, late-onset form that may produce less severe symptoms, such as mimicking PCOS.
What kind of doctors should be on my CAH care team?
CAH is primarily managed by an endocrinologist, a doctor who specializes in hormones. Your care team may also include geneticists, urologists, and counselors who specialize in chronic endocrine conditions.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Who will be the primary point of contact on my/my child's multidisciplinary care team, and do you collaborate with geneticists or urologists when necessary?
  2. 2.How often will we need to schedule regular follow-up visits and routine lab work to ensure the treatment plan is working?
  3. 3.Can you recommend a reputable patient advocacy group or a psychological counselor who has experience with chronic endocrine conditions?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (5)
  1. 1

    Congenital Adrenal Hyperplasia Due to Steroid 21-Hydroxylase Deficiency: An Endocrine Society Clinical Practice Guideline.

    Speiser PW, Arlt W, Auchus RJ, et al.

    The Journal of clinical endocrinology and metabolism 2018; (103(11)):4043-4088 doi:10.1210/jc.2018-01865.

    PMID: 30272171
  2. 2

    Steroid 21-hydroxylase deficiency in congenital adrenal hyperplasia.

    Parsa AA, New MI

    The Journal of steroid biochemistry and molecular biology 2017; (165(Pt A)):2-11 doi:10.1016/j.jsbmb.2016.06.015.

    PMID: 27380651
  3. 3

    The spectrum of CYP21A2 gene mutations in patients with classic salt wasting form of 2l-hydroxylase deficiency in a Chinese cohort.

    Liu Y, Zheng J, Liu N, et al.

    Molecular genetics & genomic medicine 2020; (8(11)):e1501 doi:10.1002/mgg3.1501.

    PMID: 32959514
  4. 4

    MECHANISMS IN ENDOCRINOLOGY: Rare defects in adrenal steroidogenesis.

    Miller WL

    European journal of endocrinology 2018; (179(3)):R125-R141.

    PMID: 29880708
  5. 5

    Management challenges and therapeutic advances in congenital adrenal hyperplasia.

    Mallappa A, Merke DP

    Nature reviews. Endocrinology 2022; (18(6)):337-352 doi:10.1038/s41574-022-00655-w.

    PMID: 35411073

This overview of Congenital Adrenal Hyperplasia is for informational purposes only and does not replace professional medical advice. Always consult your endocrinologist and care team regarding your specific diagnosis and treatment plan.

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