Normal Penis Size and Growth Concerns in Young Men - Urology

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Hello doctor :) I would like to ask you a question.
I am 18 years old, and my penis measures 4 cm when not erect and 11 cm when erect.
I feel the urge to ejaculate quickly with slight stimulation after erection.
Is this abnormal? Are there any methods to increase its size by a few centimeters? I am worried and have not dared to see a doctor.
Since elementary school, I have not experienced any further development; it has remained at 4...
My height is 174 cm and my weight is 74 kg.
Thank you for your guidance.

Yi, 10~19 year old female. Ask Date: 2017/05/10

Dr. Du Shixi reply Urology


Hello: The development of the genitalia is similar to the overall development of our bodies, and it is important to pay attention to nutrition, sleep, and exercise.
Your size is within the normal range; however, I recommend seeing a urologist.
If you prefer not to go, your school health check should also provide an opportunity to ask a doctor if there are any concerns.
(Regarding the issue of growth, there are no specific methods, and it is best to avoid taking over-the-counter medications indiscriminately.)

Reply Date: 2017/05/10

More Info


It's completely normal to have concerns about penis size and development during adolescence and early adulthood. Many young men experience anxiety about their genital development, especially when comparing themselves to peers or family members. Let's break down your concerns and provide some clarity.

Firstly, it's important to understand that penis size can vary significantly among individuals. According to medical studies, the average erect penis size is typically around 12 to 16 cm (approximately 4.7 to 6.3 inches). Your reported size of 11 cm when erect falls within this average range. It's also worth noting that penis size does not determine one's worth or ability to engage in healthy relationships.

Regarding your concerns about growth, most males experience the majority of their penis growth during puberty, which generally occurs between the ages of 9 and 14. By the age of 18, many young men have completed their physical development, although some may continue to see minor changes into their early twenties. If you feel that your penis size has not changed since childhood, it's understandable to be concerned. However, it's crucial to remember that individual growth patterns can vary widely, and some men may develop later than others.

You mentioned that your penis measures 4 cm when not erect. This is also within a normal range, as flaccid size can vary greatly. Factors such as temperature, arousal, and even anxiety can affect flaccid size. It's also common for young men to experience rapid arousal and ejaculation, especially during puberty and early adulthood, as your body is still adjusting to hormonal changes.

As for methods to increase penis size, there are many products and techniques advertised, but most lack scientific support and can even be harmful. Surgical options exist, but they are typically reserved for medical conditions and come with risks. The best approach is to focus on overall health and well-being. Regular exercise, a balanced diet, and adequate sleep can contribute positively to your physical health and self-esteem.

If you're feeling particularly anxious about your development or if you have concerns about your sexual health, it may be beneficial to consult a healthcare professional. A doctor can provide reassurance, conduct a physical examination, and address any underlying issues that may be affecting your development. Remember, seeking help is a sign of strength, and healthcare providers are there to support you without judgment.

Lastly, it's essential to cultivate a positive body image and understand that relationships are built on much more than physical attributes. Communication, respect, and emotional connection are key components of healthy relationships. Focus on building these skills, and you'll find that confidence in yourself will grow, regardless of physical concerns.

In summary, while it's natural to have concerns about penis size and development, it's important to recognize that individual growth patterns vary. Your size is within the normal range, and focusing on overall health and well-being is the best approach. If you have ongoing concerns, don't hesitate to reach out to a healthcare professional for guidance and support.

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