Sperm abnormalities are one of the causes of male infertility; some abnormalities affect the sperm’s ability to perform its functions and may render it unable to fertilize the egg. The rate of sperm abnormalities is steadily increasing due to the many negative factors around us, raising many questions about the causes of sperm abnormalities and how to treat them.
So, what causes sperm abnormalities in men? Do sperm abnormalities prevent pregnancy? And if the abnormality rate is 97% or 98%, can pregnancy occur?
Normal sperm shape
Sperm consists of several parts, each with characteristics that affect sperm function. The parts of the sperm are:
- Head: The sperm head contains the man’s genetic material (DNA). It is oval-shaped with a smooth surface. At the front of the head is the acrosome, which is essential for fertilization and makes up 40–70% of the head’s volume.
- Midpiece (neck): The part responsible for supplying the sperm with the energy needed for movement, as it contains mitochondria. The midpiece connects the sperm head to its tail.
- Tail: The longest part of the sperm, responsible for sperm movement and guiding it so it can reach the egg to fertilize it.
What are sperm abnormalities?
A change in the normal structure of any part of the sperm that may hinder its ability to fertilize the egg. Sperm abnormalities include the following changes:
- Head: Change in head size – rounded head – multiple vacuoles in the head – presence of two heads – change in acrosome size or complete absence.
- Midpiece: Increased or decreased thickness – irregular shape – midpiece size exceeding one-third of the head size.
- Tail: The sperm tail may be absent, short, multiple, bent, coiled, or irregular in thickness.
Normal abnormality rate of sperm
According to World Health Organization guidelines, the maximum normal rate of abnormal sperm in semen is 96% without a negative impact on fertility. However, if the percentage of healthy sperm drops below 4% and, conversely, the percentage of abnormal sperm rises above 96%, a man’s ability to conceive decreases.
On the other hand, Kruger’s criteria indicate that the percentage of healthy sperm should not be less than 14%.
Degrees of sperm abnormalities
Based on semen analysis results, the degree of sperm abnormalities—according to Kruger’s criteria—is determined as follows:
- Mild abnormality: The percentage of healthy sperm ranges from 10–14%.
- Moderate abnormality: The percentage of healthy sperm ranges from 5–9%.
- Severe abnormality: The percentage of healthy sperm is less than 5%.
Types of sperm abnormalities
Sperm abnormalities may be genetic or acquired, as follows:
- Genetic abnormalities: Certain genetic disorders cause abnormalities in sperm structure. In this case, abnormalities are monomorphic across all sperm (Monomorphic), such as a round head, and genetic sperm abnormalities are usually difficult to treat.
- Acquired abnormalities: This is the most common type and occurs due to several acquired causes, such as varicocele and obesity. Acquired abnormalities are often polymorphic (Polymorphic).
What causes sperm abnormalities in men?
The causes of sperm abnormalities vary, and more than one cause may occur at the same time. The most common causes include:
- Smoking.
- Obesity.
- Infection.
- Diabetes.
- Varicocele.
- Alcohol consumption.
- Severe testicular trauma.
- Side effects of certain medications.
- Chemotherapy and radiotherapy sessions.
- Poor nutrition and antioxidant deficiency.
- Frequent exposure of the testicles to high temperatures.
Some recent studies have also reported that advancing age is a cause of sperm abnormalities, as the quality of sperm produced by the testicles decreases.
Symptoms of sperm abnormalities
There are no specific symptoms of sperm abnormalities other than delayed conception. However, a semen analysis (Semen analysis) helps determine the abnormality rate, as it includes sperm morphology assessment. It is often performed to investigate causes of delayed conception or as part of premarital screening to ensure your reproductive capacity.
Sperm morphology analysis
Diagnosing sperm abnormalities in men relies on a semen analysis, which shows sperm count, the percentage of abnormalities, sperm motility, and other details about semen status.
The doctor examines a semen sample under a microscope using a special stain. Usually, examining only 200 sperm is sufficient to determine the abnormality rate in semen analysis.
In addition, the Teratozoospermia Index (TZI) is calculated using a mathematical formula that includes the number of abnormalities and their location. The index ranges from 1 to 3: 1 indicates abnormalities concentrated in only one part of the sperm, while 3 indicates that all three sperm parts are affected by abnormalities.
Sperm abnormalities and pregnancy
Given the close link between sperm quality and successful fertilization, sperm abnormalities may pose an obstacle to pregnancy. However, fertilization may still succeed despite a high percentage of abnormal sperm. Details are as follows:
Can an abnormal sperm fertilize the egg?
The possibility of fertilizing the egg remains despite sperm abnormalities, depending on the nature of the structural abnormality. In some cases, abnormalities do not prevent the sperm from reaching the egg and it can fertilize it normally. In other cases, fertilization may be impossible, such as when the acrosome is absent from the sperm head.
Do sperm abnormalities prevent pregnancy?
Recent studies indicate that natural pregnancy is possible when the percentage of abnormal sperm reaches 96% in semen. However, if the abnormality rate in semen analysis exceeds 96%, the likelihood of natural pregnancy usually decreases, depending on the nature of the abnormalities and their location in the sperm. Modern techniques provide several options for conception if natural pregnancy is not possible, such as:
- Intrauterine insemination (IUI).
- In vitro fertilization (IVF).
- Intracytoplasmic sperm injection (ICSI).
With a 97% abnormality rate, can pregnancy occur?
The chances of natural pregnancy decrease with a 97% abnormality rate, as it should not exceed 96% according to World Health Organization (WHO) guidelines. However, some couples may still conceive naturally, while others need to see a doctor to reduce the abnormality rate or use assisted reproductive techniques.
With a 98% abnormality rate, can pregnancy occur?
A high sperm abnormality rate is associated with delayed conception; therefore, the chances of fertilization decrease with a 98% abnormality rate. Depending on the nature of the abnormalities and their cause, the doctor determines the treatment approach—either dietary recommendations and health guidance to improve sperm quality and reduce abnormalities, or other options such as ICSI.
Can I get pregnant if my husband has 99% abnormalities?
There is no doubt that the chances of pregnancy decrease significantly with a 99% abnormality rate due to the scarcity of healthy sperm capable of fertilizing the egg. However, adhering to the treatment plan set by the doctor may help reduce the abnormality rate below 99%, improving the chances of natural pregnancy over time. The solution may also lie in modern techniques such as ICSI.
My husband has 99% abnormalities and I got pregnant
A high abnormality rate reaching 99% does not mean that pregnancy chances are completely absent; it depends on the type and location of the abnormalities in the sperm. Not all abnormalities hinder egg fertilization, and the small number of healthy sperm may be sufficient for fertilization.
In all cases, we recommend medical consultation to reduce the abnormality rate and enhance reproductive ability, ensuring better chances of pregnancy in the future.
99% abnormality rate and ICSI
ICSI is an excellent option when the abnormality rate reaches 99% and there is no response to other treatment methods. In ICSI, the doctor selects the best sperm to create embryos, which enhances the chances of conception—especially with good preparation of both partners according to the doctor’s instructions.
My husband has 100% abnormalities
A 100% abnormality rate is often linked to genetic factors that cause a defect in sperm production affecting all testicular output. However, other factors may also lead to such severe sperm abnormalities. In general, ICSI is recommended when natural pregnancy is not possible and the abnormality rate does not improve.
With a 100% abnormality rate, can pregnancy occur?
In a 2016 study, it was found that 29.2% of those with a 100% sperm abnormality rate were able to achieve a completely natural pregnancy. This shows that whether pregnancy occurs depends on a range of different factors in both partners, and is not determined by sperm abnormalities alone, which may affect the sperm’s ability to fertilize the egg.
Another study reported that successful pregnancy rates using ICSI in cases with a 100% abnormality rate reach 38.8%.
Ways to treat sperm abnormalities
Treatment of sperm abnormalities depends on medical advice to improve lifestyle, support testicular health, and gradually increase sperm quality. The doctor determines the best treatment plan for each case. The treatment plan may include:
1- A healthy diet
Your doctor will provide dietary recommendations that support fertility and improve testicular cell activity, while limiting unhealthy eating habits that increase sperm abnormalities, such as:
- Losing excess weight.
- Quitting smoking and alcohol.
- Following a balanced, calorie-controlled diet..
- Limiting unhealthy foods, such as fried foods and high-fat foods.
- Eating foods rich in antioxidants, such as L-carnitine, vitamin E, and vitamin C.
- Taking dietary supplements recommended by the doctor, while adhering to the prescribed doses.
2- Improving testicular health
The following tips help improve testicular health, which directly reflects on sperm quality:
- Do not place a laptop directly on your thighs.
- Avoid wearing tight clothing, especially in summer.
- Start treating varicocele—if present—under medical supervision.
- Reduce exposure to radiation or toxic chemicals.
By following these medical recommendations, you will notice an improvement in overall health, and oxidative stress that weakens sperm quality will decrease. You can monitor improvement in sperm abnormality rates by performing a semen analysis every 3 months or as directed by your doctor.
These recommendations may not be sufficient to treat some sperm abnormalities, especially severe cases or those caused by genetic factors, which requires further medical interventions to achieve the dream of having children.
3- Assisted reproductive techniques (IUI – IVF/ICSI)
If sperm morphology analysis does not show improvement, with ongoing delayed conception, your doctor may advise using medical techniques that help achieve pregnancy despite a high sperm abnormality rate, including:
- Intrauterine insemination (IUI)
A simple procedure that involves injecting sperm directly into the uterus to increase the chances of reaching and fertilizing the egg. It is suitable for overcoming mild sperm abnormalities that hinder movement.
- In vitro fertilization (IVF)
A medical procedure that involves collecting sperm and eggs from the couple to achieve fertilization in the lab. The egg is placed with sperm in a suitable medium for fertilization to occur spontaneously. This is used in moderate abnormality cases or when IUI fails.
- Intracytoplasmic sperm injection (ICSI)
It aims to treat delayed conception in severe cases of male infertility, such as a 99% abnormality rate. It is more precise than conventional IVF, as the doctor injects a carefully selected sperm directly into the egg to fertilize it, ensuring greater chances of forming high-quality embryos.
What is the best treatment for sperm abnormalities?
The best treatment varies from one case to another. Determining the best treatment depends on the doctor’s assessment and is primarily based on the degree and causes of abnormalities, as well as other factors that affect fertilization chances, such as:
- Sperm count.
- Sperm motility.
- The wife’s age and egg quality.
In general, ICSI is considered the best treatment for severe sperm abnormalities because it allows selecting the highest-quality sperm from a semen sample.
Is there a medication to treat sperm abnormalities?
There is no specific medication that reduces the abnormality rate in all cases. However, some antioxidants help support testicular health, such as:
- L-carnitine.
- Vitamin C.
- Vitamin E.
- Selenium.
- N-acetylcysteine.
Some patients may also need antibiotics or anti-inflammatory medications in other cases, such as epididymitis or orchitis, to improve sperm quality and reduce abnormalities. Therefore, it is recommended to consult a doctor before taking any medication to treat sperm abnormalities.
How long does treatment for sperm abnormalities take?
The duration of treatment varies based on the degree of abnormalities and their cause. Treatment may range from a few weeks to several months. A semen analysis every three months helps evaluate treatment effectiveness, and adhering to the doctor’s recommendations undoubtedly improves response to treatment.
Treatment of delayed conception at Dr. Mohamed Wael Ragab Clinics
Dr. Mohamed Wael Ragab is one of the experts in andrology and male infertility in Egypt and the Middle East, with extensive experience in diagnosing and treating various cases of male infertility—especially sperm abnormalities—based on the latest diagnostic and therapeutic protocols. He also holds:
- A fellowship from the University of Münster, Germany.
- Membership in the European Academy of Andrology.
- A fellowship of the European Society for Sexual Medicine.
- Consultant degree in microsurgical procedures for male infertility treatment.
Our clinics provide comprehensive medical services to accurately investigate the causes of infertility and develop a personalized treatment program for each patient to achieve the dream of having children. We also offer the latest sperm selection techniques, such as MACS and ZyMōt, which increase ICSI success rates in severe abnormality cases.
So do not hesitate to contact us now to book your medical consultation appointment and begin your journey to parenthood!
Frequently asked questions about sperm problems
Before we conclude, we answer the most common questions about sperm abnormalities and other issues that may lead to delayed conception.
What is the treatment for abnormalities in semen?
Treatment depends on improving lifestyle and avoiding negative factors that reduce sperm quality. It is recommended to take antioxidants such as vitamin E, vitamin C, and L-carnitine due to their effective role in reducing the abnormality rate in semen, with the need to consult a doctor to develop a comprehensive treatment plan.
What causes sperm abnormalities in men?
Sperm abnormalities may be due to genetic factors that caused a defect in sperm formation, or acquired factors such as unhealthy habits and diseases that negatively affect testicular activity.
Can sperm abnormalities be treated?
Yes, most sperm abnormalities are treatable. The doctor determines a treatment plan to reduce the abnormality rate and increase pregnancy chances. However, genetic or severe abnormalities may be difficult to treat, in which case modern techniques such as ICSI can help you conceive.
Do sperm abnormalities cause fetal abnormalities?
There is no link between sperm abnormalities and the birth of malformed fetuses. Fetal abnormalities are due to other causes, such as genetic defects in the sperm or egg, or the mother taking unsuitable medications during pregnancy.
How do you know if sperm is healthy without an analysis?
It is not possible to confirm sperm abnormalities without a semen analysis. However, delayed conception for a year or more after marriage may indicate several possibilities, including a high sperm abnormality rate.
How can I get pregnant if my husband has abnormalities?
We recommend consulting a doctor to assess the abnormalities and develop a comprehensive treatment program to improve sperm quality, while monitoring semen analysis results. The chances of conception increase as the abnormality rate decreases, and the doctor may recommend ICSI if the abnormalities cannot be treated.
Do sperm abnormalities cause miscarriage?
There is no direct relationship between sperm abnormalities and miscarriage or failure to complete pregnancy. After successful fertilization, pregnancy may not continue for other reasons, such as DNA fragmentation in the sperm, or health problems in the wife that lead to miscarriage.
What is the relationship between DNA fragmentation and miscarriage?
An increased rate of sperm DNA fragmentation is one of the causes of early miscarriage and failure to complete pregnancy, and it is also one of the hidden causes of male infertility. Genetic disruption may stop embryo growth, so treating sperm DNA fragmentation helps improve the chances of conception.
With 35% sperm motility, can pregnancy occur?
Yes, but the chances of pregnancy decrease if sperm motility reaches 35%, as it should not be less than 40%, and progressive motility should not be less than 32%.
Can poor sperm motility and abnormalities be treated?
Yes. Your doctor will determine a comprehensive treatment plan to improve sperm motility and reduce abnormalities. In a 2025 systematic review and analysis of several medical studies, the following supplements were found to potentially help improve sperm motility or morphology:
- L-carnitine.
- N-acetylcysteine.
- Coenzyme Q10.
- Selenium.
- Vitamin E.
- Alpha-lipoic acid
- Multinutrient supplements.
In general, poor sperm motility and abnormalities require consulting a doctor to understand their impact on your fertility and the available solutions.
What is the difference between azoospermia and low sperm count?
Azoospermia (Azoospermia) means a complete absence of sperm in semen, or an extremely small amount that is barely detectable. Low sperm count (Oligospermia) refers to a sperm concentration below 15 million per milliliter of semen.
Conclusion
- Sperm abnormalities may be the reason behind delayed conception.
- Foods rich in antioxidants help enhance sperm quality.
- In difficult cases, sperm abnormalities can be treated by resorting to ICSI.
- Do not hesitate to contact Dr. Mohamed Wael Ragab Clinics to book your appointment and receive medical consultation.
Sources
- What is teratozoospermia? |inviTRA
- What Is Sperm Morphology | inviTRA
- Treatment of Teratozoospermia | inviTRA
- Outcomes of ICSI for Complete Teratozoospermia | PMC
- Teratozoospermia and male infertility | Instituto Bernabeu
- Understanding Sperm Morphology | Carolina Conceptions
- Isolated teratozoospermia: a narrative review (2024) | PMC
- What is Teratozoospermia? | Reproductive Health Wellness
- Chances of Getting Pregnant with Teratozoospermia | inviTRA
- Complete absence of normal morphology & high rates of success without ARTs | PMC
- The Effect of Dietary Supplements on Male Infertility – A Systematic Review and Meta-Analysis | MDPI (2025)