Congenital adrenal hyperplasia

MBA, MBBS

Last updated on: 19 Jun 2026 | 03:37 PM (IST)

Also known as CAH and Adrenogenital syndrome

Overview

Congenital adrenal hyperplasia (CAH) is a genetic condition present from birth that affects the adrenal glands located on the kidneys. These glands are responsible for making important hormones that help the body manage stress, maintain blood pressure, and regulate salt and water balance.

In CAH, reduced or absent enzyme activity of 21-hydroxylase (CYP21A2 gene) disrupts this process, causing the body to produce too little of certain hormones and too much of others—particularly male hormones.

Symptoms can vary based on severity but may include unusual growth patterns, early signs of puberty in children, irregular periods in females, fertility difficulties, fatigue, and, in serious cases, life-threatening salt loss in newborns.

Key Facts

Usually seen in

At birth and adolescence

Gender affected

Both male and female

Body part(s) involved

Adrenal glands

Prevalence

Worldwide: 1 in 15,000 to 20,000 births (classic 21-OH) and 1 in 1000 (nonclassic form of CAH) (2025)

Mimicking Conditions

Addison's disease (primary adrenal insufficiency)
Hypoaldosteronism and pseudohypoaldosteronism
Bilateral adrenal hemorrhage
Genital atypia
Polycystic ovary syndrome
Maternal androgen-producing tumors
Liddle syndrome
PAPSS2 deficiency (apparent DHEA sulfotransferase deficiency)
Hexose-6-phosphate dehydrogenase deficiency

Necessary health tests/imaging

Newborn screening
Blood hormone tests: Cortisol, Aldosterone, Androgen index, and Electrolyte panel.
Adrenocorticotropic hormone (ACTH) stimulation test
Genetic testing
Prenatal testing: Chorionic villus sampling (CVS)
Imaging and clinical evaluation: Pelvic ultrasonography
Bone age assessment: X-ray of both hands
Bone density assessment: DEXA scan

Treatment

Hormone replacement therapy: Hydrocortisone and Fludrocortisone.
Salt supplementation: Given to infants to maintain salt balance.
Stress-dose management: Temporary increase in steroids during fever, illness, injury, or surgery.
Emergency management: Immediate hydrocortisone injection + IV fluids for adrenal crisis.
Surgical management
Treatment for non-classic CAH: Low-dose steroids or symptom-based hormonal therapy if needed.
Fertility and reproductive care

Types of Congenital Adrenal Hyperplasia

CAH is broadly divided into two types based on the severity of hormone imbalance and its clinical effects. These include:

1. Classic CAH

It is the more serious form and is usually detected at birth. It represents a clinical spectrum, ranging from salt loss to mainly androgen excess. It has two variations:

One type affects the body’s ability to retain salt. This condition can be dangerous if not treated early.
The other type leads to excess production of male hormones. This can cause noticeable physical changes.

Quick Byte: Over 75–80% of individuals with Classic CAH have salt-wasting CAH (SW-CAH) due to low aldosterone, affecting fluid and electrolyte balance. The remaining 20–25% are classified as simple virilizing CAH (SV-CAH), where salt balance is preserved but excess androgen is present.

2. Non-classic CAH

It is a milder form that may not show up until later in life. Some people may have no symptoms at all.
Many individuals have subtle androgen excess, which may vary in intensity.
While others, especially girls and women, may notice gradual physical changes, fertility changes, irregular periods, or trouble conceiving.

Did you know?

Some rare types of CAH, like 17α-hydroxylase deficiency, are uncommon. They can cause unusual hormone patterns and help doctors identify the exact condition.

Symptoms of Congenital Adrenal Hyperplasia

Congenital adrenal hyperplasia symptoms can vary based on the type and severity of the condition. These can include:

1. Classic CAH

Ambiguous genitalia in female newborns (such as an enlarged clitoris in an infant girl)
Enlarged genitalia in a male newborn
Poor feeding
Vomiting
Dehydration
Low blood pressure
Low blood sugar (hypoglycemia)
Weight loss or poor weight gain
Early onset of puberty
Rapid growth in childhood
Shorter height in adulthood
Fertility issues
Severe acne

Note: Males usually have normal genitalia at birth, which is why diagnosis may be delayed.

2. Non-classic CAH (mild)

Early puberty signs
Acne
Irregular periods
Male pattern facial or body hair growth (hirsutism)
Deepening of the voice
Fertility issues
Male-pattern baldness (hair loss near the temples)
Rapid growth in early years, but shorter adult height

Noticing any of these changes? These symptoms don’t always mean Congenital Adrenal Hyperplasia, but it’s important to get them checked early for the right care and guidance.

Causes of Congenital Adrenal Hyperplasia

Congenital adrenal hyperplasia (CAH) affects how the adrenal glands produce three key hormones, cortisol, aldosterone, and androgens.

Cortisol helps the body manage stress, maintain blood sugar levels, and support blood pressure. Aldosterone controls salt and fluid balance. Androgens are male hormones produced in both males and females.

In CAH, the body cannot produce these hormones properly due to a deficiency of certain enzymes.

In most cases, the deficiency is due to a lack of an enzyme called 21-hydroxylase (CYP21A2 gene). Less commonly, it may be caused by a deficiency of 11-hydroxylase.

Because of this, cortisol levels are low, and aldosterone may also be reduced. At the same time, androgen levels increase, leading to early or excessive development of male characteristics.
CAH is a genetic condition inherited in an autosomal recessive pattern. This means a child develops the condition only if they inherit a faulty gene from both parents.

Risk Factors for Congenital Adrenal Hyperplasia

A person is at a higher risk if their parents or siblings have CAH. Other factors that increase the risk include:

1. Inheritance pattern: CAH is an autosomal recessive condition. A child must inherit one faulty gene from each parent to develop the disorder.

2. Carriers: If a person inherits one normal gene and one faulty gene, they are a carrier. Carriers usually do not show symptoms.

3. Risk for carrier parents:

25% chance the child will have CAH
50% chance the child will be a carrier
25% chance the child will inherit normal genes

Rare diseases may seem uncommon—but they affect millions worldwide. Curious about what makes a disease “rare” and why awareness matters?

Diagnosis of Congenital Adrenal Hyperplasia

Congenital Adrenal Hyperplasia (CAH) diagnosis involves a combination of screening, hormone testing, and genetic evaluation to confirm the condition and its type.

1. Newborn screening

Newborns are routinely screened for classic CAH, especially 21-hydroxylase deficiency, within the first few days of life.
17-hydroxyprogesterone (17-OHP): This is the key screening marker. High levels may indicate CAH and require further testing.

2. Blood hormone tests

These tests help confirm the diagnosis and assess severity.

Cortisol: Usually low in CAH.
Aldosterone: May be low, especially in salt-wasting forms.
Serum androgens: Often elevated, leading to early physical changes.
Electrolyte panel: Low sodium and high potassium may indicate salt-wasting CAH.

3. Adrenocorticotropic hormone (ACTH) stimulation test

This test is used when the diagnosis is unclear. The ACTH stimulation test checks how well your adrenal glands are working.
A small dose of the synthetic form of ACTH, called cosyntropin, is injected; that should trigger the glands to release cortisol.
Blood samples are taken before and after the injection to see the response.
If cortisol levels don’t rise as expected, it may suggest conditions like congenital adrenal hyperplasia.
This test confirms enzyme deficiency via elevated 17-hydroxyprogesterone, a hormone made by the adrenal glands in response, not just low cortisol.

4. Genetic testing

A blood test is used to identify gene mutations responsible for CAH, such as changes in the CYP21A2 gene. This is often recommended:

During pre-pregnancy genetic counselling
When the diagnosis is unclear
To confirm the specific type of CAH

4. Prenatal testing

For couples at risk, CAH can be detected during pregnancy.

Chorionic villus sampling (CVS): A test done in early pregnancy (around the 3rd month of pregnancy) to analyze fetal DNA for known gene variants.
Non-invasive testing: (NIPT): A simple blood test from the mother can detect fetal DNA and determine the baby’s sex early in pregnancy. This helps assess risk in sex-linked conditions like Fabry disease, but it cannot diagnose or rule out CAH.

5. Imaging and clinical evaluation

Pelvic ultrasonography (or USG pelvis): It may be done in infants with ambiguous genitalia to assess internal reproductive organs.
Bone age assessment: An X-ray of both hands, helps determine whether the bones are developing faster or slower than expected for the child’s age.
Bone density assessment: A DEXA scan may be used to evaluate bone strength and mineral density.

Early diagnosis ensures timely care and better long-term outcomes. Book your lab test on Tata 1mg and get accurate results from trusted labs.

Prevention of Congenital Adrenal Hyperplasia

You can’t prevent congenital adrenal hyperplasia because it is a genetic condition present from birth. If you have a family history of CAH or already have a child with the condition, you may consider genetic counseling or testing. This can help you understand the chances of passing it on to your child and make informed decisions.

Specialist to Visit

While a general physician can help identify early signs, proper management of CAH requires a multidisciplinary team, including:

Paediatric endocrinologist
Adult endocrinologist
Urologist
Surgeon

A paediatric endocrinologist plays the central role in diagnosis and treatment. They manage hormone therapy, monitor growth and development, and adjust medications over time in children.

An adult endocrinologist continues care into adulthood. They manage long-term hormone therapy, monitor fertility, bone health, and overall metabolic health.

A urologist evaluates and manages genital or urinary tract concerns, especially in children with ambiguous genitalia.

A surgeon may be involved in corrective procedures when required, particularly in cases affecting genital development.

When to see a doctor?

Seek medical attention if you or your child notice:

Poor feeding, vomiting, or dehydration in newborns
Early signs of puberty (such as early hair growth or rapid growth)
Irregular periods in girls
Excess facial or body hair
Unusual genital appearance

Early diagnosis and timely care can help manage CAH effectively and prevent complications.

Treatment of Congenital Adrenal Hyperplasia

Treatment for CAH depends on the type and severity. In classic CAH, lifelong hormone replacement is needed to maintain normal body functions and prevent complications. In non-classic CAH, treatment is symptom-based and may not always be required.

1. Hormone replacement therapy

Since the body cannot produce certain hormones on its own, they need to be replaced through medicines.

Glucocorticoids (cortisol replacement): Helps the body manage stress, maintain energy, and keep male hormone levels in check.
Example: Hydrocortisone
Mineralocorticoids (aldosterone replacement): Helps the body retain the right amount of salt and maintain healthy blood pressure and fluid balance.
Example: Fludrocortisone
Salt supplementation: Mainly required for infants with salt-wasting CAH. It helps replace the excess salt lost by the body. It is especially important in newborns and severe cases to maintain proper salt and fluid balance.

2. Stress-dose management

During times of physical stress, such as a fever, injury, or surgery, the body needs more cortisol than usual.
In such situations, doctors may temporarily increase the steroid dose to protect the body and prevent a crisis.

3. Emergency management (Adrenal crisis)

An adrenal crisis is a life-threatening situation that occurs when cortisol levels drop dangerously low.
It requires immediate medical attention, including an injection of hydrocortisone and fluids given directly into the vein to quickly restore the body's balance.

4. Surgical management (in select cases)

In some girls born with physical differences in genital appearance due to excess male hormones, surgery may be considered.
This decision is made carefully, with thorough discussion between the medical team and the family, keeping the child's well-being at the center.

5. Treatment for non-classic CAH

This milder form may not require any treatment if there are no significant symptoms.
When needed, low-dose steroid medicines can help manage concerns like early puberty or unwanted hair growth.
Women experiencing hormonal symptoms or irregular periods may also benefit from hormonal medicines as advised by their doctor.

6. Fertility and reproductive care

Balancing hormone levels through treatment can improve the chances of conception in both men and women.
Depending on individual needs, a specialist may recommend additional therapies.

Did you know?

Newer treatments like modified-release hydrocortisone or continuous subcutaneous hydrocortisone infusion can better mimic the body’s natural hormone rhythm. However, taking too many steroids causes Cushingoid effects such as weight gain, weak bones, and metabolic issues.

Manage your treatment with the right support. Explore trusted medicines and healthcare essentials on Tata 1mg.

Complications of Congenital Adrenal Hyperplasia

Managing CAH can be challenging, as both too little and too much of certain hormones can lead to health problems over time. Congenital Adrenal Hyperplasia complications can include:

1. Adrenal Crisis: When the body has too little cortisol, it struggles to handle physical stress like illness or injury. Such an event can cause extreme fatigue, weakness, shock, confusion, or collapse.

2. Excess male hormone effects in females (progressive virilization): Too much male hormone in girls and women can lead to unwanted hair growth, a deeper voice, and changes in physical appearance. These changes can also affect confidence and quality of life.

3. Shorter height: Hormonal imbalance and long-term use of steroid medicines can slow down a child's growth. As a result, many children with CAH may not grow as tall as expected.

4. Reduced fertility: CAH can disturb the hormonal balance needed for reproduction in both men and women. This may make it harder to conceive naturally.

5. Testicular adrenal rest tumors (TART): In males, non-cancerous lumps can develop inside the testes due to hormonal overstimulation. If left undetected, these can block sperm production and lead to male infertility.

6. Weaker bones: Long-term use of high-dose steroids can gradually reduce bone strength. This makes a person more prone to fractures, even from minor falls or injuries.

Protect your bones from long-term steroid effects. Find trusted bone support supplements on Tata 1mg. Remember to consult your doctor before starting any supplements.

7. Insulin resistance and impaired glucose control: Hormonal imbalance can affect how the body processes sugar, making it less efficient. Over time, this may increase the risk of developing diabetes.

Stay on top of your blood sugar. Monitor regularly with reliable glucose devices.

8. Adrenal growths (Myelolipomas): Non-cancerous lumps may form in the adrenal glands due to long-term hormonal changes. They usually cause no symptoms but may need to be monitored regularly by a doctor.

9. High blood pressure (hypertension): Both hormonal imbalance and steroid treatment can raise blood pressure over time. If not managed well, this increases the risk of heart disease and other serious complications.

Keep your blood pressure under control; check it regularly at home.

10. Weight gain and obesity: Metabolic changes caused by CAH, along with long-term steroid use, can lead to unwanted weight gain. This further adds to the risk of heart and metabolic health problems.

Explore the Tata 1mg WeightWise Program for personalised guidance and sustainable results.

11. Dyslipidemia (abnormal cholesterol levels): CAH can affect the levels of fats in the blood, leading to unhealthy cholesterol. This is an added risk factor for developing heart disease over time.

Stay informed about your cholesterol levels. Book a lipid profile test to catch changes early and take control of your heart health.

Living with Congenital Adrenal Hyperplasia

Living with congenital adrenal hyperplasia requires ongoing care, regular monitoring, and the right support system. With proper management, individuals can lead healthy and fulfilling lives.

1. Emotional and psychological well-being

Living with CAH can affect mood, confidence, and overall well-being.
Feelings of stress, anxiety, or body image concerns may arise, especially during adolescence.
Some individuals may also face challenges related to relationships and sexual health, which can impact quality of life.

What can help?

Talk to your doctor for a trusted counsellor referral
Explore low-cost counselling at government hospitals
Join local or online support groups
Encourage open family conversations
Practice simple stress-relief habits like yoga or journaling

Take care of your mental well-being alongside physical health.

2. Lifestyle and supportive care

Healthy lifestyle habits can help reduce long-term risks.
Balanced nutrition, regular physical activity, and maintaining a healthy weight are important.
Regular follow-ups to monitor growth, hormones, and treatment response
Medication adherence and dose adjustments as advised by the doctor
Stress management and emotional support
Education on managing illness, infections, or stress (e.g., when to adjust medication)

3. Regular monitoring and long-term care

CAH requires lifelong follow-up to ensure that treatment works effectively and that complications are avoided.

Hormone level checks: Regular blood tests help track hormone levels and guide treatment adjustments.
Growth and puberty monitoring: In children, height, weight, and pubertal development are closely tracked.
Heart risk monitoring: Regular checks for blood pressure, weight, cholesterol, and blood sugar help detect early risks of heart and metabolic conditions.
Medication review: Steroid doses are adjusted regularly to avoid under- or overtreatment.
Bone health monitoring: A simple X-ray may be done to assess bone growth and predict adult height

Support bone health with regular monitoring. Book a Bone & Joint Health Checkup to assess bone strength and growth.

Frequently Asked Questions

Why does CAH cause excess hair growth or irregular periods?

CAH leads to higher levels of male hormones (androgens) in the body. This can cause excess hair growth, acne, and disrupt normal menstrual cycles, leading to irregular or missed periods in females.

What precautions should people with CAH take during illness or stress?

During illness, injury, or major stress, the body needs more cortisol than usual. People with CAH may need “stress-dose” steroids to prevent adrenal crisis and should seek medical advice early.

Do I need to stress-dose before vaccinations?

Routine vaccinations are safe in children with CAH and do not usually need stress dosing. However, if your child develops a fever after vaccination, stress-dose steroids may be needed until the fever settles.

Do people with CAH need lifelong medication?

Yes, most people with classic CAH need lifelong hormone replacement therapy. This helps maintain normal hormone levels, prevent complications, and support healthy growth and development.

Are people with CAH at increased risk for osteoporosis?

Long-term steroid use in CAH may reduce bone strength and increase the risk of osteoporosis. Regular bone density checks may be advised, especially in adults or those on higher steroid doses. A healthy lifestyle and medical follow-up can help protect bone health.

References

Did our information help you?

In our relentless endeavour to keep improving our services, you are our eyes. Kindly take out sometime to guide us on how to serve your better.

Subscribe to stay informed

Subscribe to our carefully crafted informative emailers by Medical Experts and be the first to get the latest health news, tips and important updates.

Enter your email id

Want to know more?We provide you with authentic, trustworthy and relevant information

Have issues with the content?

Disclaimer

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover all possible side effects, drug interactions or warnings or alerts. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Making healthcareUnderstandable, Accessible & AffordableMade with ❤ by Tata 1mg

Overview

Key Facts

Types

Symptoms

Causes

Risk factors

Diagnosis

Prevention

Specialist to visit

Treatment

Complications

Living with

FAQs

References