What Causes Low Sperm Count? Common Reasons Men Should Know

Introduction

Low sperm count is one of the common reasons for male infertility, but many men do not know about it until they undergo a semen analysis. In simple terms, it means the semen contains fewer sperm than expected, which may reduce the chance of natural pregnancy.

The causes can include hormonal imbalance, varicocele, infections, lifestyle habits, heat exposure, genetic conditions, certain medicines, or problems with sperm production and movement. The good news is that many causes can be identified with proper fertility evaluation, and treatment options are available depending on the reason.

This blog explains the common causes, diagnosis, treatment options, lifestyle changes, and when to consult a fertility expert in Nepal.

What Is Low Sperm Count?

Low sperm count, medically known as oligospermia, means the number of sperm in semen is below the expected reference range. A semen analysis usually checks sperm concentration, total sperm count, motility, morphology, semen volume, and other factors.

Sperm count is important because a higher number of healthy sperm increases the chance that one sperm may reach and fertilize the egg. However, sperm count is not the only factor. Motility, shape, DNA quality, hormone levels, and the female partner’s fertility health also matter.

Some men with low sperm count may still achieve natural pregnancy, while others may need medical treatment or assisted reproductive techniques such as IUI, IVF, or ICSI.

How Common Is Male Infertility?

Infertility affects many couples worldwide, and male factors contribute to a significant number of cases. Male infertility may happen due to low sperm production, poor sperm movement, abnormal sperm shape, blocked sperm transport, ejaculation problems, or hormonal issues.

One important point is that male infertility is often silent. Many men feel healthy, have normal sexual function, and do not notice any symptoms. A semen analysis is often the first test that reveals low sperm count or poor sperm quality.

For couples who have been trying to conceive for 12 months without pregnancy, both partners should be evaluated. If the female partner is over 35, fertility evaluation is usually recommended after 6 months of trying.

What Causes Low Sperm Count?

There is rarely one single reason in every case. Low sperm count cause may be medical, lifestyle-related, environmental, genetic, or unexplained. Sometimes, two or more factors work together.

Below are the most common reasons men should know.

1. Varicocele

Varicocele is one of the common treatable causes of male infertility. It is an enlargement of veins inside the scrotum. These enlarged veins may increase heat around the testicles and affect sperm production.

Varicocele may reduce sperm count, sperm movement, and sperm shape. Some men feel heaviness or discomfort in the scrotum, while others have no symptoms at all.

A fertility specialist may diagnose varicocele through physical examination and ultrasound. Treatment depends on severity, semen analysis results, and the couple’s fertility plan.

2. Hormonal Imbalance

Sperm production depends on a well-balanced hormonal system. The brain, pituitary gland, and testicles work together through hormones such as FSH, LH, and testosterone.

If these hormones are too low or too high, sperm production may decrease.

Hormonal causes may include:

• Low testosterone
• Pituitary gland problems
• Thyroid disorders
• High prolactin level
• Use of testosterone injections or anabolic steroids
• Certain chronic illnesses

One important point: taking testosterone without medical guidance can reduce sperm production. Some men take testosterone for gym performance, body image, or low energy, but it may suppress natural sperm production.

Hormonal blood tests help identify whether low sperm count is connected to hormone imbalance.

3. Infections and Inflammation

Past or current infections may affect sperm production or sperm transport. Infections can involve the testicles, epididymis, prostate, or urinary tract.

Some infections may cause swelling, scarring, or blockage. Others may increase oxidative stress, which can affect sperm quality.

Possible warning signs include:

• Pain or swelling in the testicle
• Burning urination
• Pelvic discomfort
• Abnormal discharge
• Fever with scrotal pain
• History of untreated sexually transmitted infection

Not every infection causes permanent fertility problems, but early diagnosis and treatment are important.

4. Ejaculation Problems

Sometimes sperm production is normal, but sperm does not come out properly during ejaculation. This may happen due to retrograde ejaculation, obstruction, nerve problems, previous surgery, diabetes, spinal injury, or certain medicines.

In retrograde ejaculation, semen goes backward into the bladder instead of coming out through the penis. Men may notice very little semen during ejaculation.

A doctor may recommend semen analysis, urine testing after ejaculation, hormone tests, or imaging depending on the case.

5. Genetic Causes

Genetic conditions can affect sperm production. Some men may have very low sperm count or no sperm in semen due to chromosomal or Y-chromosome-related issues.

Genetic testing may be advised in severe oligospermia or azoospermia, especially when sperm concentration is extremely low.

Genetic evaluation is important because it may influence treatment planning, IVF/ICSI decisions, and counselling for future pregnancy.

6. Lifestyle Habits

Lifestyle does not explain every case, but it can influence sperm health. Sperm production takes time, and lifestyle changes usually need around 2–3 months to reflect in semen parameters.

Common lifestyle factors include:

Lifestyle Factor	Possible Effect on Sperm Health
Smoking and tobacco	May reduce sperm count, motility, and DNA quality
Heavy alcohol use	May affect hormones and sperm production
Poor sleep	May disturb hormonal balance
Obesity	May affect testosterone and semen quality
High stress	May indirectly affect hormones and sexual health
Poor diet	May reduce antioxidant support
Lack of exercise	May contribute to weight and metabolic issues

Healthy changes may not correct every medical cause, but they support better reproductive health.

7. Heat Exposure

Testicles need a slightly lower temperature than the rest of the body for healthy sperm production. Frequent heat exposure may affect sperm count and motility.

Possible sources include:

• Hot baths or sauna use
• Tight underwear for long hours
• Laptop heat on the lap
• Long-distance driving
• Working in high-temperature environments
• Fever or recent illness

Temporary sperm decline can happen after fever. In many cases, repeat semen analysis after a few months gives a clearer picture.

8. Environmental Toxins and Pollution

Exposure to toxins may affect sperm production and sperm quality. This is especially relevant for men working in industries involving chemicals, pesticides, heavy metals, solvents, radiation, or high heat.

Urban pollution, smoking exposure, and occupational chemicals may increase oxidative stress. Men with regular exposure should discuss workplace protection and fertility evaluation with a specialist.

9. Medicines and Medical Treatments

Certain medicines may affect sperm production, ejaculation, hormones, or sperm movement. These may include some medicines used for infections, high blood pressure, depression, anxiety, arthritis, cancer treatment, digestive problems, or hormone-related conditions.

Cancer treatments such as chemotherapy and radiation may significantly affect sperm production. Men planning such treatment should discuss sperm freezing before starting therapy when possible.

Never stop prescribed medicine without consulting a doctor. Instead, discuss fertility concerns with a healthcare professional.

10. Chronic Health Conditions

General health and fertility are closely connected. Some chronic diseases can affect hormones, nerves, blood flow, inflammation, or sperm production.

Conditions that may be linked with male fertility problems include:

• Diabetes
• Thyroid disease
• Kidney disease
• Liver disease
• Obesity
• Autoimmune disorders
• Cancer
• Long-term infections
• Previous testicular injury or surgery

A fertility evaluation may also reveal health issues that need treatment beyond fertility care.

11. Poor Sperm Motility and Morphology

Some men have a normal sperm count but poor motility or abnormal morphology. Others may have all three issues together: low count, low motility, and poor shape.

Motility means how well sperm move.
Progressive motility means sperm are moving forward effectively.
Morphology means the shape and structure of sperm.

Pregnancy depends not only on how many sperm are present but also on how well they move and whether they can fertilize the egg.

Understanding Semen Analysis Results

A semen analysis is the main test for male fertility evaluation. It should be done correctly because results may vary from sample to sample.

Doctors often recommend repeating the test because sperm count can change due to fever, stress, incomplete sample collection, long abstinence, illness, or lifestyle changes.

Common Semen Analysis Parameters

Parameter	What It Means	Why It Matters
Semen volume	Amount of semen released	Low volume may suggest collection issue, blockage, or gland problem
Sperm concentration	Sperm per milliliter	Helps identify low sperm count
Total sperm count	Total sperm in the full sample	Gives a wider fertility picture
Motility	Percentage of moving sperm	Needed for sperm to reach the egg
Progressive motility	Sperm moving forward	Important for natural conception
Morphology	Sperm shape	May affect fertilization potential
pH and cells	Semen environment and inflammation signs	May suggest infection or obstruction

A single abnormal result does not always mean permanent infertility. Interpretation should be done with medical history, physical examination, and sometimes hormone or imaging tests.

Symptoms of Low Sperm Count

Many men do not have any obvious symptoms. The most common sign is difficulty achieving pregnancy with a partner.

However, some men may notice symptoms related to the underlying cause.

Possible symptoms include:

• Difficulty conceiving after regular unprotected intercourse
• Pain, swelling, or lump in the testicle
• Reduced facial or body hair due to hormonal issues
• Low sexual desire
• Erectile or ejaculation problems
• Very low semen volume
• History of testicular injury, surgery, or infection

Because symptoms may be absent, semen analysis is important when pregnancy is delayed.

When Should Men Get Checked?

Men should consider fertility testing when:

• Pregnancy has not happened after 12 months of trying
• Female partner is over 35 and pregnancy has not happened after 6 months
• There is a known low sperm count report
• There is history of testicular surgery, injury, or infection
• There is swelling, pain, or heaviness in the scrotum
• There is erectile or ejaculation difficulty
• There is history of chemotherapy, radiation, or major illness
• IVF or IUI is being planned
• There has been recurrent pregnancy loss

Male fertility testing is not something to delay or feel embarrassed about. It is a medical evaluation, just like checking blood pressure or sugar level.

How Is Low Sperm Count Diagnosed?

Diagnosis usually starts with a semen analysis. Depending on the result, the fertility specialist may recommend additional tests.

Common Tests

Test	Purpose
Semen analysis	Checks sperm count, motility, morphology, and volume
Hormone profile	Evaluates testosterone, FSH, LH, prolactin, thyroid, and other hormones
Scrotal ultrasound	Checks varicocele, testicular structure, or obstruction
Infection screening	Detects reproductive or urinary infection
Genetic testing	Used in severe low sperm count or azoospermia
Sperm DNA fragmentation test	May be advised in IVF failure, recurrent miscarriage, or unexplained infertility

The right test depends on the semen report and medical history.

Low Sperm Count Treatment: What Are the Options?

Low sperm count treatment depends on the cause. There is no single treatment that works for everyone.

1. Lifestyle Correction

For mild abnormalities, doctors may recommend lifestyle changes for at least 3 months.

This may include:

• Stopping tobacco use
• Avoiding excessive alcohol
• Maintaining healthy weight
• Improving sleep
• Regular moderate exercise
• Reducing heat exposure
• Eating antioxidant-rich foods
• Managing stress
• Avoiding unnecessary supplements or steroids

Lifestyle changes are most helpful when combined with proper medical evaluation.

2. Treating Infection

If infection or inflammation is found, the doctor may prescribe medicines. Treatment should be guided by test results, not self-medication.

Untreated infection may affect sperm movement, cause discomfort, or lead to blockage in some cases.

3. Hormonal Treatment

If hormonal imbalance is confirmed, treatment may help improve sperm production. The approach depends on the cause.

Some men may need medicines that stimulate natural hormone pathways. Others may need treatment for thyroid, prolactin, or pituitary-related problems.

Hormonal treatment should always be supervised by a specialist because wrong treatment can worsen sperm production.

4. Varicocele Treatment

If varicocele is significant and semen quality is affected, the doctor may discuss surgical correction. Not every varicocele requires surgery.

Decision depends on:

• Semen analysis result
• Grade of varicocele
• Testicular size
• Symptoms
• Female partner’s age and fertility status
• Couple’s timeline for pregnancy

Improvement in semen parameters may take several months after treatment.

5. IUI

Intrauterine insemination, or IUI, may be considered in mild male factor infertility when enough motile sperm are available after sperm preparation.

In IUI, prepared sperm are placed directly inside the uterus around ovulation. It is less advanced than IVF but may be useful in selected cases.

6. IVF and ICSI

For moderate to severe male factor infertility, IVF or ICSI may be recommended.

In IVF, eggs and sperm are combined in the laboratory.
In ICSI, a single sperm is injected directly into an egg.

ICSI is commonly used when sperm count, motility, or morphology is significantly low. For couples considering IVF in Nepal, proper male fertility evaluation helps doctors choose the most suitable approach.

7. Sperm Retrieval Techniques

In some cases, sperm may be absent from the semen due to blockage or very low production. If sperm are present inside the testicle, sperm retrieval techniques may be considered along with IVF/ICSI.

This is a specialist decision and requires detailed evaluation.

Can Low Sperm Count Be Prevented?

Not all causes can be prevented, especially genetic conditions, testicular development problems, or certain medical conditions. However, men can reduce avoidable risks.

Helpful steps include:

• Avoid smoking and tobacco
• Avoid anabolic steroids
• Maintain healthy weight
• Treat infections early
• Protect the testicles from injury
• Avoid frequent heat exposure
• Use protective equipment around chemicals
• Manage diabetes, thyroid disease, and other chronic conditions
• Seek medical advice before taking fertility supplements

Prevention is not about perfection. It is about reducing risk and protecting sperm health over time.

Foods That May Support Sperm Health

No food can guarantee a higher sperm count, but a balanced diet supports hormone health, antioxidant protection, and overall reproductive function.

Helpful foods may include:

Nutrient	Food Sources	Fertility Relevance
Zinc	Eggs, beans, nuts, seeds, seafood	Supports sperm production
Folate	Green leafy vegetables, lentils, beans	Supports cell development
Vitamin C	Citrus fruits, guava, kiwi, bell peppers	Antioxidant support
Vitamin E	Nuts, seeds, vegetable oils	Antioxidant support
Omega-3 fats	Fatty fish, walnuts, flaxseed	May support sperm membrane health
Protein	Eggs, dairy, lentils, fish, lean meat	Supports hormone and tissue health
Antioxidants	Fruits and vegetables	Helps reduce oxidative stress

A fertility-friendly diet should be practical, sustainable, and medically appropriate. Men with diabetes, kidney disease, or other conditions should follow personalized dietary advice.

Myths About Low Sperm Count

Myth 1: Low sperm count means pregnancy is impossible

Not always. Pregnancy may still happen if sperm are present, motile, and able to fertilize an egg. The chance depends on sperm count, motility, female partner’s fertility, age, and timing.

Myth 2: Only women need fertility testing

Both partners should be evaluated. Male factors are common and may be treatable.

Myth 3: Supplements always increase sperm count

Supplements may help only in selected cases. They should not replace diagnosis and treatment.

Myth 4: One semen report is final

Sperm count can vary. Many doctors advise repeat testing before making major decisions.

Myth 5: Good sexual performance means normal sperm count

Sexual performance and sperm count are different. A man may have normal erection and ejaculation but still have low sperm count.

Low Sperm Count and IVF in Nepal

When low sperm count is mild, lifestyle changes, medicine, or IUI may be considered. When the count is very low, or motility and morphology are also poor, IVF with ICSI may provide a better chance in selected cases.

A fertility expert in Nepal can guide couples based on semen analysis, female partner’s age, egg reserve, ovulation health, fallopian tube status, and previous pregnancy history.

At Slavica IVF and Research Center, male fertility assessment may include semen analysis and further evaluation when needed. The treatment plan should be individualized because the cause of low sperm count is different for every man.

When to Consult a Fertility Expert in Nepal

Consult a fertility specialist when pregnancy is delayed, semen analysis is abnormal, or there is a history of testicular, hormonal, infectious, or sexual health concerns.

Early evaluation helps avoid unnecessary delay. It also helps couples understand whether the problem is mild, moderate, severe, or related to both partners.

Male fertility care is not only about sperm count. It is about understanding the full reproductive picture and choosing the safest, most appropriate next step.

FAQs About Low Sperm Count

How to increase sperm count?

Sperm count may improve by treating the cause. Helpful steps include stopping tobacco, avoiding anabolic steroids, reducing alcohol, improving sleep, maintaining healthy weight, eating antioxidant-rich foods, avoiding heat exposure, treating infections, and correcting hormonal problems under medical supervision.

 

Can I get pregnant with a low sperm count?

Yes, pregnancy can still happen with low sperm count if sperm are present and able to move and fertilize the egg. However, the chance may be lower. The result depends on sperm count, motility, morphology, female partner’s age, ovulation, tubes, and overall fertility health.

 

How to treat low sperm motility?

Low sperm motility treatment depends on the cause. It may involve lifestyle changes, antioxidant support, infection treatment, varicocele management, hormone correction, or assisted reproductive techniques such as IUI, IVF, or ICSI. A semen analysis and specialist evaluation are needed before treatment.

 

What is the cost of low sperm count?

There is no fixed cost for low sperm count because cost depends on the required tests and treatment. A basic semen analysis costs less than advanced testing or procedures. Treatment may involve medicines, hormone tests, ultrasound, varicocele treatment, IUI, IVF, or ICSI. Couples should consult the fertility center for updated pricing.

 

Is 70% active sperm good?

In many semen reports, 70% active or motile sperm is generally a favorable sign. However, fertility depends on more than motility alone. Sperm concentration, total count, progressive motility, morphology, semen volume, DNA quality, and the female partner’s fertility health also matter.

 

What foods boost sperm count?

Foods that may support sperm health include eggs, nuts, seeds, lentils, beans, green leafy vegetables, citrus fruits, guava, fish, walnuts, whole grains, and colorful fruits and vegetables. These provide protein, zinc, folate, omega-3 fats, and antioxidants. Food helps overall health, but medical causes still need evaluation.

 

Conclusion

Low sperm count is a common but manageable male fertility concern. It may happen due to varicocele, hormone imbalance, infection, heat exposure, lifestyle habits, medicine, genetic factors, chronic illness, or unexplained reasons.

A semen analysis is the first step, but treatment should be based on the cause. Some men improve with lifestyle correction or medical treatment, while others may need IUI, IVF, or ICSI.

For couples planning fertility treatment or IVF in Nepal, early male fertility evaluation can save time, reduce confusion, and support better decision-making. A fertility expert can help identify the reason and recommend a personalized treatment plan.