Causes and Risk Factors for Infertility in Males

Overview

Infertility is the medical term for when a couple is unable to become pregnant despite frequent and unprotected sex for at least one year. Male infertility can be caused by various factors. Here are some common causes of infertility in males:

Problems with sperm: Semen is the fluid that carries sperm. Issues with semen, such as a low sperm count (less than 15 million), low sperm motility (ability to swim), or abnormal sperm shape, can make it difficult for sperm to fertilize an egg.
Testicular conditions: Certain medical conditions, infections, or surgeries affecting the testicles can lead to infertility in males. Varicocele is a condition that occurs when the veins of the testicles are enlarged. The increased blood flow and heat in the testicles can affect sperm production and quality. There can also be abnormalities of the structures of the epididymis or vas deferens, two structures involved in the transport of sperm to the urethra.
Overheated testicles: Testicles need to be at a slightly lower temperature than the rest of the body for optimal sperm production. Factors that can overheat the testicles include an undescended testicle, varicocele, wearing tight clothes, using saunas or hot tubs frequently, and working in hot environments.
Genetic disorders: Genetic defects such as Klinefelter syndrome, karyotypic abnormalities, gene copy number variations (CNVs), single gene mutations/polymorphisms, and deletions on the Y chromosome (Yq microdeletions) can interfere with the development of male reproductive organs or impair sperm production and function.
Lifestyle factors: Heavy drinking, smoking, drug use, and certain medications (like anabolic steroids) can negatively impact male fertility.
Other factors: Chemotherapy or radiation therapy used to treat cancer can affect sperm production. Additionally, cystic fibrosis is known to cause infertility in men.

Non-modifiable Risk Factors (Risk Factors You Can't Change)

Non-modifiable risk factors are risk factors that cannot be changed. Non-modifiable risk factors for infertility in males include:

Age: Increasing age is a non-modifiable risk factor for infertility in males. As men get older, their sperm quality and quantity may decrease, making it more difficult to conceive.
Genetics: Genetic predispositions can also contribute to male infertility. Having a positive family history of infertility or certain genetic conditions can increase the risk. For example, certain genetic mutations or abnormalities may affect sperm production or function.
Medical conditions: These conditions include retrograde ejaculation (where semen enters the bladder instead of being ejaculated), undescended testicles (when the testicles do not move down into the scrotum), and hormonal imbalances such as low testosterone production. These conditions can interfere with sperm production or delivery.

Modifiable Risk Factors (Factors You May Be Able to Change)

Modifiable risk factors for infertility in males can be influenced by individual habits and lifestyle. They include:

Body mass index (BMI): BMI is a measure of body fat based on height and weight. A higher BMI is associated with a higher risk of male infertility.
Body fat percentage: Similar to BMI, body fat percentage is also associated with male infertility. Individuals with a higher body fat percentage have a higher risk of infertility.
Alcohol consumption: Excessive alcohol consumption can negatively impact male fertility.
Smoking: Smoking is associated with reduction in sperm quantity and motility.
Sexual dysfunction: Erectile dysfunction and infrequent vaginal intercourse can interfere with fertility.

If you have concerns about your risk of male infertility or any other health condition, it is best to consult with your healthcare professional for personalized advice and guidance.

Reducing Risks

There are several actions that a person can take to modify their risk factors and prevent or reduce the chances of male infertility. Here are some steps you can take:

Quit smoking: Smoking significantly increases the risk of infertility in both males and females. It can lower sperm count and undermine the effects of fertility treatment. If you smoke, consider quitting to improve your chances of conceiving.
Limit alcohol consumption: Heavy alcohol use has been linked to reduced sperm health and fertility problems. It's important to moderate your alcohol intake or consider abstaining altogether.
Avoid drugs: Consumption of drugs such as cannabis or cocaine can lower sperm count and cause fertility problems in both males and females. It's best to avoid using these substances if you're trying to conceive.
Maintain a healthy weight: Being overweight or underweight can affect hormone levels and reduce fertility in males. Aim for a healthy weight by eating a balanced diet and engaging in regular physical activity.
Minimize exposure to environmental toxins: Environmental toxins, such as pesticides and lead, can have harmful effects on sperm health. Take precautions to minimize your exposure to these substances, especially if you work in industries where you may come into contact with them.
Manage underlying health conditions: Certain health conditions, such as mumps, kidney disease, or hormone problems, can impact male fertility. It's important to manage these conditions with proper medical care to reduce their impact on fertility.
Consider antioxidant supplements: Some studies have shown that antioxidants may help improve sperm function in cases of idiopathic male infertility (infertility with an unknown cause). However, it's important to note that more research is needed in this area before making any definitive recommendations. Talk to your doctor before starting any supplements.

By taking these steps, you can modify your risk factors and improve your chances of preventing or reducing male infertility. Remember, it's always best to consult with your doctor for personalized advice based on your specific situation.