AIA News Blog

Micropenis is a medical term for a penis, usually diagnosed at birth, that is well under the normal size range for an infant. In every other way, including structure, appearance, and function, a micropenis is like any other healthy penis.

Before birth, a male infant’s genitalia develop in response to certain hormones, mainly androgens.

If his body doesn’t produce enough androgens or if the body doesn’t respond normally to androgen production, one result can be a micropenis, also called a microphallus.

Medical disorders that affect the pituitary gland or the hypothalamus, both of which play key roles in hormone production, are associated with micropenis.

While a micropenis can develop on its own, with no other hormone-related conditions, it can occur along with other disorders.

It’s not always clear why some boys are born with a hormone disorder that causes micropenis. Family history of micropenis may raise the risk. A 2011 French studyTrusted Source, suggests that fetal exposure to pesticides and other chemicals may increase the chances of micropenis development.

What it is and what it isn’t

Assuming there are no other health concerns, a micropenis functions the same as a normal, healthy penis. The ability to urinate and become erect shouldn’t be affected.

A micropenis is sometimes associated with a lower sperm count, however, so fertility may be reduced.

In addition to getting a personal and family medical history, the doctor will do a physical examination. That should include a proper measurement of the penis.

To make a thorough diagnosis, the doctor may order a blood test to check for hormone disorders.

If you suspect your baby has a micropenis, consult a pediatric urologist or a pediatric endocrinologist.

A urologist is a doctor who specializes in the health of the urinary tract and male reproductive system. An endocrinologist specializes in hormone disorders.

If you have any concerns about your own genitalia, see a urologist who treats adult patients.