What is a micropenis?

You are probably reading this lines because you think you (or maybe your son) might have a micropenis, looking for methods to enlarge it or something similar. This page covers all the basics you need to know about the condition and is strictly based on medical facts and research. Please note that this page features some NSWF images so proceed with caution!

 Let's begin with the basics:

What is a micropenis?
Micropenis is a medical term used to describe an abnormally small penis. The most common criterion used to define a micropenis is a dorsal  erect penile length of at least 2.5 standard deviations smaller than the average human penis size. Confused?

In simple words, this means that any male adult with an erect penis of 7-9 cm (3.5 inches) or less should be evaluated for micro penis. For male newborns, the mean stretched penile length is around 3.5 cm and thus any baby with a stretched penile length of 2.0 cm or less, should also be evaluated for the condition. It is estimated that around 1 in every 200 individuals has the condition (0,5 %).

Please note that there is not an exact borderline for micropenises as numerous factors (like age and ethnicity) have to be taken under consideration before categorizing a penis as a micropenis.

To elaborate a bit more, a study named "Should the definition of micropenis vary according to ethnicity?" concludes yes because "Mean penile length and diameter are slightly but significantly smaller in newborns of Chinese origin compared to newborns of Caucasian and East-Indian origins."

Here's a photo of an adult man with the condition:

a 7 cm (2.5 inches) erect micropenis
Erect border-line micropenis - 7 cm (2 1/2 inches)
Photo submitted by Rune

It should be also mentioned that the micropenis term is typically used when the penis has a normal appearance with no other accompanying genital malformations, like hypospadias, epispadias, cryptorchidism etc. In the latter scenario, the term microphallus is preferred.

The condition should be differentiated from "hidden penis", which is a normal-sized penis obscured by excessive suprapubic fat.

When and how can the condition be diagnosed ?
The condition is easily diagnosed at any age. A quick examination by a doctor or a physician will suffice. An individual can even perform a self-diagnosis, granted that he knows how to properly measure his penis.

However, several more examinations may be required, as it common for the micropenis condition to be accompanied by other ailments, usually hormonal in nature like Klinefelter syndrome and Leydig cell hypoplasia.

In most cases the condition is diagnosed right after birth.

What are the causes? 
The exact causes behind the condition have yet to be explored and understood in full extent. However, we do know that the condition is many times the result of several hormonal abnormalities (sex-chromosomes related) that occur during the second and third semester of pregnancy.

In most cases - more than 50 % - the condition is accompanied by hypogonadotropic hypogonadism, which is the failure of the hypothalamus to produce an adequate amount of gonadotropin-releasing hormone (GnRH). About 25 % of patients have hypergonadotrophic hypogonadism and 15 % have end organ hormonal insensitivity, predominantly due to androgen insensitivity from growth hormone defects.

It is also possible for mikropenis to be a part of other genetic malformation syndromes that are not related to sex chromosomes. For example, it can be an early sign of congenital growth-hormone deficiency or congenital hypopituitarism.

Several homeobox genes (a large family of 235 genes that direct the formation of many body structures during early embryonic development) have also been found to affect penis and digit size with no detectable hormone abnormalities.

Utero exposure to certain estrogen based fertility drugs like diethylstilbestrol (DES) has been linked to various genital abnormalities including the micropenis condition.

Finally, a 2012 study showed that uncontrolled domestic pesticide use increases the likelihood of newborns with a micropenis and/or other genital malformations.

Problems caused by having a very small penis
Some problems commonly reported by patients with the condition are:
  • Difficulty to urinate when standing
  • Difficulty to have sexual intercourse
  • Various psychological problems, ranging from "minor" - like low self-esteem and difficulty talking to women- to more serious, like suicidal thoughts.

erect 3.5 inches micropenis
Another orderline micro penis about 3.5 inches erect

Conditions associated with the micropenis condition
As aforementioned, the condition is often times accompanied by other problems. The majority of these accompanying conditions are of reduced prenatal androgen production or effect. Some noteable examples include:
  • Androgen insensitivity syndromes
  • Fryns syndrome
  • Fraser syndrome (also known as Meyer-Schwickerath's syndrome)
  • Inadequate pituitary stimulation Gonadotropin deficiency Other forms of congenital hypogonadism.
  • Kallmann syndrome (often with un-descended testicles)
  • Klinefelter syndrome
  • Laron syndrome
  • Leydig cell hypoplasia
  • Partial androgen insensitivity syndrome (PAIS)
  • Robinow syndrome
  • Septo-optic dysplasia (de Morsier syndrome)
  • Specific defects of testosterone
  • Testicular dysgenesis
  • 17,20-lyase deficiency
  • 5α-reductase deficiency

Unfortunately, there is no easy and quick treatment for patients with a micro-penis. Still, there are many clinically tried methods that can induce some growth. However, each patient is unique and the optimal treatment varies on a case-to-case base, depending on the patient's age, medical history and the severity of the condition (how small the penis is).

shaftless micropenis with total abscence of shaft
An extreme case

Treatments for adults
As of now there are two clinically proven ways to enlarge an adult's penis and thus a mikropenis. Click the corresponding links, to read more for each option:
  • Using a penis traction device: A 2006 study has showed that penis enlargement using a traction device is possible. However, this is an option for border-line micropenises (3.0 inches when erect or larger). Anything smaller than that will not properly fit into said devices. This is also the method I have personally used to enlarge my penis from 5.0 inches to 5.8 inches.
  • Phalloplasty: Phalloplasty is a type of surgery that among others, is also used for penis enlargement. There have been been many successful examples, some of which are featured in the studies section of the site. Notable is the case of Sergei, a Russian guy who initially had a penis that was about 2 inches long when erect. Using a technique that resembles the one used for female to male transgenders, his doctors enlarged it to 7 inches!
  • Human Chorionic Gonadotropin, may have possible future applications for the treatment of adults. However this hormone treatment is still experimental, having been tried only once, in a small sample of men all with  Idiopathic Hypogonadotrophic Hypogonadism.

a circumcised micropenis about 1.5 inches long when erect
Erect Micropenis in an Adult
More small penis pics

Treatments for children
Hormone treatment (with testosterone) has shown very promising results in the treatment of micropenis, especially when given at a very young age. For example, a study published in 1999 showed that 1 or 2 short courses of testosterone have a high success ratio (more than 80 %) in augmenting penile size into the normal range. The latter is especially true for micropenises resulting from fetal testosterone deficiency.

Discontinued Treatments
In the past, many doctors opted newborns with the condition for a sex reassignment operation. In the past years the approach has been abandoned for a variety of reasons which are thoroughly explained here.

Are you a concerned parent?
Many parents are concerned that their son may have a smaller than average penis. As aforementioned, the condition is diagnosed at birth. However, it sometimes goes unnoticed and then it's too late to "fix" it with hormonal therapy. Here's a table showing the normal penis size in inches for each age group. Please click here for some extra parental advice.

AgeNormal: Mean +/- 1 SD (inches)Abnormal: Mean – 2.5 SD (inches)
0-5 months1.5 +/- 0.30.75
6-12 months1.7 +/- 0.30.9
1-2 years1.9 +/- 0.31.0
2-3 years2.0 +/- 0.41.1
3-4 years2.2 +/- 0.41.3
4-5 years2.2 +/- 0.41.4
5-8 years2.4 +/- 0.41.5
8-11 years2.5 +/- 0.41.5
Adult5.2 +/- 0.63.7

It should be noted that most 8 to 14 year old boys referred to a doctor for a micro penis do not actually have the condition. Such concerns are usually explained by one of the following reasons:
  • Obesity - a penis may be concealed in suprapubic fat 
  • A large body and frame that makes the penis appear small
  • Delayed puberty with good reasons to expect future normal growth.

Don't forget, reading stuff on the Internet is great but nothing can replace the opinion of a specialist! Please consult a doctor if you are worried about your son's health!

Not be confused with Small penis syndrome
Micropenis and Small penis syndrome are two totally different things and should not be confused with each other. The latter is a type of body dysmorphic disorder (a mental disorder via obsessive preoccupation with a perceived defect in one's own appearance) in which the man thinks his penis is too small even though it isn't.

Perhaps one reason men have this anxiety is because many of them have no idea what a normal-size penis looks like. Interestingly, a study has shown that about 15% of men admit they don't know how they compare to the average.

Any other questions?
Got any other questions not covered by the article? If yes, I invite you to check the other sections of the site using the menu at the top. You can find almost anything from studies to documentaries to personal stories from guys with a micro penis.

If you still have questions I invite you to leave a comment using the comment form below. I would be happy to assist you!

Do you have one?


  1. How is the penis traction done?

  2. I always knew I had a small penis never knew it had a name for it

  3. yeah im 19 and i thot it was always just small. this really sucks. havnt decided what to do yet. suicide is definetly an option gonna go see a doctor soon to see my options

    1. Honey, suicide is never an option....acceptance of oneself is a first and foremost...and sexual satisfaction takes on many pleasureable forms! ;)

  4. I was born yrs ago by a contry dr. They just thought it was nature no horomonies were given so just put up with micro penis and small testicles always had diffuclity urinating when standing.The sex thing was a whole different page trying to please a woman was not good.

  5. 52 married 5 kids i have a micro

  6. My boyfriend has one and he knows how to use it. There are so many ways to satisfy your woman. Just be willing to make sure that she is satisfied before intercourse. I, even, have orgasms when he is inside me. I try to find ways to please him as well. Oh guys......BJs are much more exciting with a micro !!!

  7. Thank you for this site! I am 22 y.o. and until now I always thought I was small but didn't know I have actually a medical condition with a name (my fully erect penis is about 5cm long which I think would be a little more than 2 inches, so it can be considered a misropenis!). I am also happy that others have shared their experiences, so that me and my girlfriend don't need to be afraid not to have babies in future. And for others that might read this blog, I am in a long-term relationship with a girlfriend and she is satisfied with me, she said that it doesn't bother her when I asked her, so don't worry, you can have a good relationship and sexual life even if you have a micropenis!

  8. WOW thank you guys fully erect my penis is 2 1/2 cm s have hidden away most of my life
    Great to see men like me

  9. I'm almost 3.7 on the dot when fully erect. Does this mean I have a micro?

  10. I just found this site. I have always been curious as to just how well I stack up and I'm not that surprised to find out that I also have a micro-penis. I have always had urination issues while standing and I'm a life long bed wetter. Having an accident in my early 20's has put me back in diapers 24/7 and I am now in my late 40's. One day while getting changed I happened to have had a pack of matches laying near by on the night stand.....(lighting candles)...LOL....anyway, I began to get an erection and picked up the matchbook cover and laid it next to my penis. To my shock and amazement, the matchbook cover was larger than my penis in both length and width. No I know what my mother meant when she told me that I belonged in diapers. After looking through the info here and the growth chart.....my penis falls into the category between a newborn and a toddler. It doesn't bother me...even slightly that I am in diapers and have an extremely small penis. Life is to short to worry about such things.


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