Close
Open
Share on Facebook
Twitter
Email
 
Notice: Users may be experiencing issues with displaying some pages on stanfordhealthcare.org. We are working closely with our technical teams to resolve the issue as quickly as possible. Thank you for your patience.
 

Find the latest information on COVID-19, monkeypox, and the flu vaccine

Menu
Search
Menu
Search
  • Doctors, Clinics & Locations, Conditions & Treatments
  • Patients & Visitors
  • MyHealth
  • Billing
  • Insurance
  • Medical Records
  • Support Groups
  • Financial Assistance
  • COVID-19 Resource Center
  • Locations and Parking
  • Visitor Policy
  • Hospital Check-in
  • Video Visits
  • International Patients
  • Contact Us
View All Information for Patients & Visitors »
We are available to assist you 24/7.
650-498-3333
GuestServices@stanfordhealthcare.org


View the changes to our visitor policy »

 

View information for Guest Services »

New to MyHealth?

Manage Your Care From Anywhere.

Access your health information from any device with MyHealth.  You can message your clinic, view lab results, schedule an appointment, and pay your bill.

ALREADY HAVE AN ACCESS CODE?

Activate Account

DON'T HAVE AN ACCESS CODE?

Create a New Account

NEED MORE DETAILS?

Learn More about MyHealth »
Learn More about Video Visits »

MyHealth for Mobile

Get the iPhone MyHealth app »
Get the Android MyHealth app »

WELCOME BACK

Forgot Username or Password?
Need Help?

Clear

Causes of Gynecomastia

  • About
  • About
Overview
Symptoms
Causes
Diagnosis
  • Blood Tests
  • Urinalysis
  • Mammogram
Treatments
  • Surgery
Overview
Symptoms
Causes
Diagnosis
  • Blood Tests
  • Urinalysis
  • Mammogram
Treatments
  • Surgery

What causes gynecomastia?

In newborns, gynecomastia is caused by estrogen from the mother. Breast buds are common in baby boys. Breast buds tend to go away gradually by 6 months of age, but they can last longer in some babies.

In preteen boys, breast buds are common during puberty. The buds may last up to 2 years, but they tend to go away within the first year. Gynecomastia can also be caused by an estrogen-producing tumor.

In teen boys, gynecomastia is caused by the hormonal changes of puberty. Gynecomastia occurs in many boys during early puberty to middle puberty. It usually goes away within 6 months to 2 years.

In adult males, gynecomastia is usually caused by another condition, such as liver or lung cancer, cirrhosis of the liver, overactive thyroid, or by hormone problems, such as cancer of the pituitary gland, adrenal glands, or testicles. Alcohol, marijuana, methamphetamine, and heroin use also may cause gynecomastia. In older males, gynecomastia can be caused by a change in hormone levels.

Use of certain medicines may also cause gynecomastia, including:

  • Steroids, such as prednisone or dexamethasone.
  • Medicines used to treat ulcers (such as cimetidine).
  • Medicines used to treat epilepsy (such as phenytoin [Dilantin]).
  • Digitalis and other heart medicines.
  • Chemotherapy drugs, especially alkylating agents, a family of anticancer drugs that interfere with cell DNA and inhibit cancer cell growth
  • Antiandrogen drugs (such as flutamide, cyproterone, and spironolactone).
  • Antianxiety and antidepressant medicines (such as diazepam [Valium] and tricyclic antidepressants).
Previous Section Next Section

Clinics for Causes

  • Cosmetic Plastic Surgery Clinic
    650-498-9868
  • Plastic and Reconstructive Surgery Clinic
    650-723-7001
  • Find a Doctor
  • Find Conditions & Treatments
  • Find a Stanford clinic
  • For Patients & Visitors
  • Billing
  • Protections Against Surprise Medical Bills
  • Insurance
  • Hospital Check-in
  • Contact Us
  • Video Visits
  • Send a Greeting Card
  • Get a Second Opinion
  • COVID-19 Resource Center
  • Behavioral Standards
  • Make a Gift
  • About Us
  • Quality & Safety
  • Annual Report
  • 300 Pasteur Drive Renewal Program
  • Stanford Health Care – Now
  • For Healthcare Professionals
  • Referring Physicians
  • Nursing
  • Allied Healthcare Professionals
First Responders
  • Newsroom
  • Careers
  • Volunteering
  • Vendors
  • Stanford Medicine Partners
  • Stanford Health Care Tri-Valley
  • Stanford Medicine
  • Stanford Medicine Children's Health
  • Stanford University
  • Legal
  • Privacy
  • Code of Conduct
  • |   Notice of Nondiscrimination      ©2022 Stanford Health Care. All Rights Reserved
Home
Close
Doctors
Clinics & Locations
Conditions & Treatments
Clinical Trials
MyHealth Login

Patients & Visitors
Billing
Insurance
Financial Assistance
Medical Records
Contact Us
Video Visits
Get a Second Opinion
COVID-19 Resource Center
Healthcare Professionals
Referring Physicians
Nursing
Allied Healthcare
About Us
Quality & Safety
Careers
Newsroom
Make a Donation
Stanford Health Care – Now
Close