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I am a 58-year-old. What causes nipple discharge in males?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

I am 58 years old, male, weigh 251 pounds, and I am 5 feet 10 inches tall. What is the size of the milk duct tubes in my chest behind the nipples? What are the chances of any fluid coming out of them? What steps should I take to manage this?

Kindly advise.

Answered by Dr. Ashraf Ghani

Education:

MD

Professional Bio:

Dr. Ashraf Ghani is a dedicated general medicine physician committed to providing comprehensive and evidence-based healthcare for adult patients. He has experience in diagnosing and managing a wide range of acute and chronic medical conditions, including diabetes, hypertension, infections, respiratory illnesses, and lifestyle-related disorders. Dr. Ashraf Ghani focuses on accurate diagnosis, preventive care, and personalized treatment plans tailored to each patient's needs. Known for his compassionate and patient-centered approach, Dr. Ashraf Ghani strives to help patients achieve better health through clear communication and quality medical care.  

This doctor is not available for online consultations on the platform anymore.

Hello,

Welcome to icliniq.com.

I understand your concern.

In men, the milk ducts behind the nipples are present but remain rudimentary and underdeveloped compared to those in women. These ducts are typically very small, often just a few mm (millimeters) in diameter, and in most cases, they remain inactive throughout life. However, under certain conditions, such as hormonal imbalances (such as elevated prolactin or estrogen levels), use of certain medications, or underlying health issues, fluid discharge from the nipple, known as galactorrhea or nipple discharge, can occur, even in men.

While it is not common, it is also not unheard of. Given your age and weight, and the fact that you are on Sertraline (which can, in rare cases, affect hormone levels), the chance of experiencing discharge is not zero but still relatively low unless another underlying issue is present.

If you ever notice nipple discharge, especially if it is bloody, persistent, or accompanied by a lump or changes in the nipple, it is important to get it evaluated to rule out conditions such as duct ectasia, infections, or, in rare cases, more serious concerns. Regular self-awareness and prompt evaluation of any changes in the breast or nipple area are essential.

I hope you are satisfied with my answer. For further queries, you can consult me at iCliniq.

Thank you.

Patient's Query

Hello doctor,

I have read that the milk ducts in men are usually no more than two millimeters in diameter. Is this correct? Since they are not fully developed, they tend to remain compressed and should not exceed two millimeters in a healthy male. I also believe that duct ectasia is typically defined as a duct measuring three millimeters or more in diameter, especially in the milk ducts located in the breast area behind the nipples.

Kindly advise.

Answered by Dr. Ashraf Ghani

Education:

MD

Professional Bio:

Dr. Ashraf Ghani is a dedicated general medicine physician committed to providing comprehensive and evidence-based healthcare for adult patients. He has experience in diagnosing and managing a wide range of acute and chronic medical conditions, including diabetes, hypertension, infections, respiratory illnesses, and lifestyle-related disorders. Dr. Ashraf Ghani focuses on accurate diagnosis, preventive care, and personalized treatment plans tailored to each patient's needs. Known for his compassionate and patient-centered approach, Dr. Ashraf Ghani strives to help patients achieve better health through clear communication and quality medical care.  

This doctor is not available for online consultations on the platform anymore.

Hello,

Welcome back to icliniq.com.

I understand your concern.

So you are correct in your understanding that milk ducts in healthy men are typically underdeveloped and usually measure no more than about two millimeters in diameter. In males, the breast tissue remains rudimentary because it is not stimulated by the high levels of estrogen and progesterone that drive breast development in females. As a result, the ductal system remains narrow, flattened, and non-functional. These ducts are usually dormant and not involved in any physiological secretion.

When a duct measures around three millimeters or more in diameter in men, it is considered mildly dilated, and this often falls under a condition called duct ectasia. Duct ectasia refers to the abnormal widening of one or more milk ducts, which can sometimes lead to nipple discharge, tenderness, or even inflammation.

While duct ectasia is more commonly discussed in the context of women, it can also occur in men, though much less frequently. In males, duct ectasia is often associated with hormonal imbalances, local inflammation, or, very rarely, underlying masses or pathology within the breast tissue.

So yes, in the context of male anatomy, ducts greater than two to three millimeters are considered wider than normal, and if found incidentally or about symptoms like nipple discharge, they warrant further investigation. Imaging, such as an ultrasound or mammogram (yes, even in men), will be used to assess the ducts and surrounding tissue.

However, in the absence of symptoms or abnormal findings, ducts around or under two millimeters in diameter are entirely normal for men and usually not a cause for concern.

I hope you are satisfied with my answer. For further queries, you can consult me at iCliniq.

Thank you.

Medically reviewed by iCliniq medical review team
Published At October 10, 2025
Reviewed At October 15, 2025

Education:

MD

Professional Bio:

Dr. Ashraf Ghani is a dedicated general medicine physician committed to providing comprehensive and evidence-based healthcare for adult patients. He has experience in diagnosing and managing a wide range of acute and chronic medical conditions, including diabetes, hypertension, infections, respiratory illnesses, and lifestyle-related disorders. Dr. Ashraf Ghani focuses on accurate diagnosis, preventive care, and personalized treatment plans tailored to each patient's needs. Known for his compassionate and patient-centered approach, Dr. Ashraf Ghani strives to help patients achieve better health through clear communication and quality medical care.  

This doctor is not available for online consultations on the platform anymore.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Education:

MD

Professional Bio:

Dr. Ashraf Ghani is a dedicated general medicine physician committed to providing comprehensive and evidence-based healthcare for adult patients. He has experience in diagnosing and managing a wide range of acute and chronic medical conditions, including diabetes, hypertension, infections, respiratory illnesses, and lifestyle-related disorders. Dr. Ashraf Ghani focuses on accurate diagnosis, preventive care, and personalized treatment plans tailored to each patient's needs. Known for his compassionate and patient-centered approach, Dr. Ashraf Ghani strives to help patients achieve better health through clear communication and quality medical care.  

This doctor is not available for online consultations on the platform anymore.

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