Cowden Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Sumiran Racherla, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Cowden Syndrome?
A clinical geneticist, a doctor who diagnoses inherited conditions, usually leads care for Cowden syndrome. Other specialists, such as an oncologist (a cancer doctor), help monitor cancer risk. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is Cowden syndrome?
Cowden syndrome is a genetic disorder. It causes multiple noncancerous, tumor-like growths called hamartomas. It also raises the risk of certain cancers.
It is part of a group called PTEN hamartoma tumor syndrome. Experts estimate that about 1 in 200,000 people have Cowden syndrome.
Symptoms
Almost everyone with Cowden syndrome develops hamartomas. They are most often found on the skin and mucous membranes, such as the lining of the mouth and nose. They can also occur in the intestine and other parts of the body.
Growths on the skin and mucous membranes typically become clear by a person's late twenties.
The syndrome can also cause a large head, polyps in the digestive tract, and skin and mucous membrane lesions. Some people have developmental delay or autism spectrum disorder.
Causes and who gets it
It is caused by changes in genes. The PTEN, KLLN, or WWP1 gene is most often involved. About 25 percent of cases result from changes in the PTEN gene. In some cases the cause is unknown.
The PTEN protein normally prevents cells from growing too fast. Changes in the gene stop it from working well, which leads to growths and tumors.
Cowden syndrome follows an autosomal dominant pattern. One altered copy of the gene is enough to cause it. A person may inherit the change from a parent, or it may be new.
Cowden syndrome raises the risk of cancers of the breast, the thyroid, and the lining of the uterus. Kidney cancer, colorectal cancer, and melanoma have also been found. People with it develop these cancers at younger ages, often starting in their thirties or forties.
How doctors diagnose it
Doctors confirm the diagnosis with genetic testing that finds a PTEN gene change. Some people do not meet all the criteria but have some features. They are described as having Cowden-like syndrome.
Genetic testing is also recommended for at-risk relatives.
Treatment
Care is best given by a team of specialists, ideally with experience in this condition. Treatment depends on the problem. It can include treatment for skin lesions and polyp removal during endoscopy. Doctors also monitor thyroid nodules.
Skin lesions should be removed only if cancer is suspected or symptoms are significant. Surgery may lead to scar overgrowth and quick return of the lesions.
Doctors suggest regular checks because of the cancer risk. These include a yearly physical and skin exam. They also include a yearly thyroid exam and ultrasound starting at age 12. Mammograms and breast MRI start at age 30. Doctors also suggest being careful with radiation exposure.
When to see a doctor
See a doctor if you or your child has skin or mouth growths, a large head, or digestive polyps. These are signs of this condition. People with Cowden syndrome should learn about the signs and symptoms of cancer each year.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. A direct primary care doctor can help arrange genetic counseling and keep track of your screening schedule. They can also coordinate with specialists.
Common questions
Is Cowden syndrome the same as PTEN hamartoma tumor syndrome?
Cowden syndrome is one form of PTEN hamartoma tumor syndrome. Researchers think they form a spectrum of overlapping features.
Which cancers are linked to Cowden syndrome?
The main ones are cancers of the breast, the thyroid, and the lining of the uterus. The risk of these cancers is higher than usual.
Is Cowden syndrome inherited?
Yes, it can be. It follows an autosomal dominant pattern. In some cases it is new in a person with no family history.
How common is Cowden syndrome?
It is rare, at about 1 in 200,000 people.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
