Hepatitis B: Causes, Symptoms, Transmission, and Treatment

Hepatitis B is a contagious infection caused by a virus called HBV that directly targets the liver and causes inflammation at the cellular level in the organ. The main symptoms of the disease are fatigue, extreme loss of energy, nausea, and yellowing observed in the skin and whites of the eyes. Its treatment is based on the use of antiviral medications that suppress the replication rate of the virus and the protection of liver functions under medical supervision. This condition, which often progresses insidiously, has the potential to become chronic and disrupt the body’s overall biological balance when not treated in a timely manner. Thanks to early diagnosis, proper medical follow-up, and steps that support the immune system, the disease can be successfully brought under control.

What Is the Hepatitis B Virus?

We can think of our liver as a massive and highly complex chemical factory in our body. This vital organ, which has countless duties ranging from clearing toxins from our body to processing nutrients, is the main target where the Hepatitis B virus seeks to settle. After entering the body, the virus reaches the liver directly through the bloodstream and infiltrates liver cells (hepatocytes), where it begins to produce copies of itself. When our immune system detects this foreign invader, it develops a strong defensive response to destroy the virus. The inflammation in the liver, which we call inflammation, is the result of this battle. The first incubation period of the disease may last for weeks or even months, and during this stage the person is generally unaware of the illness. This strong response of the immune system may cause some strain on liver tissue during the acute period. The truly concerning picture, however, is when the immune system fails to defeat the virus and the infection progresses into a chronic stage lasting months or even years. A chronic infection has the potential to cause cellular damage and scar tissue in the liver over time. This condition may turn into a long-term health problem that deeply affects not only digestive and metabolic functions but also the body’s overall energy balance. Moreover, while this insidious virus multiplies in the liver, it silently travels through the bloodstream to other parts of the body, especially toward the reproductive organs.

What Are the Symptoms of Hepatitis B and How Does the Disease Manifest Itself?

When the virus first enters the body or during flare-up periods of a chronic infection, certain physical warning signs emerge together with a decrease in bodily energy. These signals generally develop due to the increased workload of the liver and the intense energy spent by the immune system. During periods when the infection is active, the clinical symptoms that most challenge the individual in daily life are as follows:

• Weakness
• Fatigue
• Loss of appetite
• Nausea
• Vomiting
• Abdominal pain
• Dark-colored urine
• Pale-colored stool
• Joint pain
• Yellowing of the skin
• Yellowing of the whites of the eyes

How Is the Hepatitis B Virus Transmitted Sexually or Through Other Routes?

When the transmission mechanism of the Hepatitis B virus is examined, it is seen that this microscopic organism can survive for a certain period even outside the body and is highly resistant. The most common route of transmission among adults is unprotected sexual contact. The virus can easily pass into a new body not only through blood but also through microcracks in mucous membranes or through fluid exchange. In order to prevent the spread of the disease, it is very important to know in which fluids the virus is found at higher concentrations in the human body. Body fluids that carry a high risk of transmission are as follows:

• Blood
• Saliva
• Seminal fluid
• Vaginal secretions

The fact that seminal fluid (semen) is included among these listed body fluids clearly demonstrates how seriously the issue must be taken in terms of male reproductive health. During unprotected intimacy, the likelihood of the virus being transmitted to the partner is quite high. This situation is a highly critical matter that concerns not only the health dynamics between couples but also the health of the mother and baby in future planned pregnancies.

How Does Chronic Hepatitis B Infection Affect the Male Reproductive System?

It is possible to imagine the male reproductive system as a highly fine-tuned production and maturation facility. Sperm cells produced in the testicles gain the ability to swim and reach the maturity required for fertilization as they pass through the coiled ducts called the epididymis. However, in the presence of chronic Hepatitis B infection, this delicate microenvironment comes under serious threat. When the virus reaches the reproductive organs, it initiates an inflammatory process in these regions as well. Just as in the liver, immune system cells rush to this area and release certain defensive chemicals to fight the virus. The increase of these chemicals in the reproductive ducts causes a highly destructive biological storm called “oxidative stress.”

To explain oxidative stress simply, we can compare it to iron coming into contact with oxygen and rusting. This cellular-level rusting or poisoning seriously damages the membranes and internal structures of sperm cells. One of the most important characteristics of a sperm cell is its ability to travel a long distance with sufficient energy and movement capability in order to reach the prospective mother’s egg. In the tail part of the sperm, there are microscopic motors called “mitochondria,” in other words energy powerhouses, that provide this movement. The oxidative storm disrupts the internal balance of these energy powerhouses. When the membrane potential of the mitochondria decreases, the sperm cell becomes unable to produce the energy it needs. Like a battery that has run out of power, sperm movement slows down and their ability to swim forward weakens significantly. This condition, called “asthenozoospermia” in medicine, is one of the main factors that greatly reduces the chance of having a child naturally.

Can the Hepatitis B Virus Enter Sperm Cells?

One of the most striking and perhaps thought-provoking findings reached by scientific research is that the Hepatitis B virus is not limited to circulating around cells but is capable of directly infiltrating the internal structure of the sperm cell. The virus is a microscopic capsule that carries its own genetic material (DNA). As a result of long-term exposure in the male reproductive ducts, certain viral fragments and specific genes may advance as far as the nucleus of the sperm cell. The nucleus is the most sacred and protected area where all the genetic codes that the sperm will transfer from the father to the baby are stored.

If the virus reaches this area, there is a risk that it may combine its own genetic codes with the genetic sequence of the sperm, in other words “integrate.” The addition of a foreign and viral code to this extremely sensitive genetic code may completely disrupt cellular balance. If a sperm cell loaded with viral codes in this way manages to fertilize an egg, the viral materials are also carried into the resulting embryo. As the embryo’s cells attempt to divide and grow, these foreign genetic codes mixed into the process may disrupt development. This molecular chaos has the potential to cause early arrest of embryo development, failure of attachment to the uterus (implantation), or recurrent miscarriages in the later weeks of pregnancy.

Why Is Sperm DNA Damage Important in the Presence of Hepatitis B?

When people apply to healthcare centers with suspected infertility, the first method that comes to mind and is most commonly performed is a standard sperm test (spermiogram). However, in more complex scenarios involving viral infections, the appearance of a high sperm count or normal sperm shape under a standard microscope may not mean that everything is fine. Beyond microscopic imaging, the DNA structure, which is the true carrying power of the sperm, must be examined.

Sperm DNA damage refers to breaks, ruptures, or wear occurring in the double-stranded chains that form the genetic code. We can compare this condition to a music CD with fine scratches that cannot be seen on its surface; although the CD looks intact from the outside, it cannot play the music or gets stuck when placed into the device. In people who have had a Hepatitis B infection, free radicals produced during the body’s fight against the virus create fine scratches and breaks in this genetic code. In a sperm sample considered healthy, the proportion of this damage is expected to remain well below a certain level. An increase in the level of damage significantly reduces the likelihood that the resulting embryo will continue dividing in a healthy manner, even if the sperm has the physical capacity to fertilize the egg. Therefore, before treatment planning, it is of great importance to perform advanced DNA damage tests that determine the proportion of these molecular-level breaks.

Which Supportive Treatments Are Applied to Repair Sperm DNA Damage?

A multidimensional approach is required to alleviate this cellular fatigue and the breaks occurring in the genetic material and to support the body’s own repair mechanisms. First, if there are additional vascular problems such as varicocele in the testicular region that may increase cellular stress, these are evaluated, and any existing bacterial infections are treated. In addition, powerful antioxidant programs are used to reduce oxidative stress and revitalize the energy centers of the cells. Supportive components frequently used during treatment processes are as follows:

• L-Carnitine
• L-Arginine
• Vitamin D
• Vitamin C
• Vitamin E
• Folic acid
• Zinc
• Selenium
• Coenzyme Q10

These supportive elements aim to slow cellular rusting, increase the durability of the cell membrane, and preserve the structural integrity of sperm. When used regularly under specialist supervision, they may make valuable contributions to reducing the burden of DNA damage and increasing the chance of obtaining a healthy embryo.

What Is the Effect of Antiviral Medications on Sperm Quality in Hepatitis B Patients?

Special antiviral medications developed to suppress the viral load in the liver and prevent organ damage are a fundamental cornerstone in the management of the disease. The main task of these medications is to slow down the replication rate of the virus and gradually reduce its activity in the body. Clinical observations show that these treatments may have very positive effects not only on liver values but also on sperm quality.

As the treatment process progresses and the virus in the body is suppressed, the destructive oxidative storm created by the immune system in the reproductive ducts gradually begins to subside. As inflammation decreases, the testicular microenvironment relaxes and the cells gain the opportunity to develop in a healthier environment. In patients who use antiviral medications regularly for a certain period, it is likely that a noticeable improvement will be observed in sperm vitality rates and forward swimming movements. Of course, the dose and duration of the medications must be planned individually according to the person’s liver enzyme values and the viral load level in the blood. When treatment compliance is achieved, expecting a substantial improvement in reproductive potential is quite realistic.

How Are Sperm Washing Methods Applied in Hepatitis B-Positive Men?

When assisted reproductive techniques such as intrauterine insemination or in vitro fertilization are initiated, the top priority is not only to achieve a pregnancy but also to ensure that this pregnancy occurs under the safest conditions for both the mother and the baby. Using semen obtained directly in the laboratory is not preferred because of the high viral load and toxic substances it contains. Therefore, highly meticulous and technological purification procedures called “sperm washing” are used in medical laboratories.

In the first of these procedures, the “Swim-up” method, semen is injected beneath a special nutrient fluid and allowed to rest. During this process, only the most motile, healthiest, and morphologically normal sperm manage to swim upward into the clean fluid. The remaining virus particles, damaged cells, and inflammatory cells remain at the bottom. Another more comprehensive method is the “Density Gradient” technique. In this method, the semen sample is passed through special filter layers with different densities and spun at high speed (centrifuged). This mechanical filtration process separates the sperm from surrounding free virus particles and toxic cellular waste at a microscopic level. As a result, the cell cluster obtained is largely purified for use in the fertilization procedure, and the risk of transmission is reduced to negligible levels.

Which Technologies Are Used to Reduce the Risk of Hepatitis B in In Vitro Fertilization Treatments?

After obtaining a sperm pool cleared of viruses and cellular waste, the most critical stage is finding that “single” sperm to be selected for fertilizing the prospective mother’s egg. In cases with a history of viral infection and a risk of DNA damage, magnification under standard microscopes may not always be sufficient to see the finest details. At this point, Intracytoplasmic Morphologically Selected Sperm Injection, known in short as IMSI technology, comes into play.

In standard in vitro fertilization procedures, sperm images are magnified a few hundred times under the microscope, whereas in devices equipped with IMSI hardware, cells can be examined thousands of times larger and in greater detail, generally up to 8,000 times, thanks to special lens systems. This enormous magnification capacity makes visible the smallest vacuoles, deformities, or structural weaknesses in the head region of the sperm where the genetic code is packaged. The sperm with the lowest likelihood of breaks or damage in its genetic material, the smoothest external appearance, and the most regular cellular architecture is carefully selected. This high-quality sperm is placed directly into the egg, and the fertilization process is initiated. This advanced technological approach is a powerful tool that significantly supports the embryo’s chance of implantation and developing into a healthy pregnancy.

Which Surgical Methods Are Preferred in Cases of Azoospermia Caused by Hepatitis B?

As a result of the combination of regional inflammation caused by the infection, hormonal imbalances, or various congenital factors, no sperm cells may sometimes be found in the semen. This condition is called “azoospermia” and is divided into different categories within itself. If the main problem is disruption of the sperm production process in the testicles, the most rational approach is generally microscopic surgical techniques. The Micro-TESE operation performed in this context is a delicate procedure carried out under anesthesia in which testicular tissue is examined with an advanced surgical microscope. Specialists examine the tissue layer by layer and identify very fine tubules that appear wider and fuller than the others and have the potential to produce sperm. Millimetric tissue samples are taken only from these specific areas, and the presence of sperm is investigated in the laboratory. This microscopic approach minimizes damage to the tissue while supporting the likelihood of finding sperm.

On the other hand, if the problem is not in production but in an obstruction in the ducts that carry sperm, the condition is managed differently. Severe previous infections or inflammation around the prostate may lead to narrowing or cyst formation in the ducts through which sperm are expelled. In these obstruction cases, closed (endoscopic) methods may be applied by entering through the urinary tract without making any open surgical incision, allowing the cysts or narrowed areas causing the obstruction to be opened. Once the ducts are relieved, there is a possibility that the natural flow of sperm may be restored.

How Is Sperm Freezing Performed in Hepatitis B Carriers?

Freezing and storing high-quality sperm obtained during assisted reproductive treatment processes or healthy embryos formed after fertilization for many years for future use is a highly common and reliable procedure. This freezing process, called cryopreservation, is performed in liquid nitrogen tanks at subzero temperatures. However, storing cells belonging to individuals who carry viral infections requires very strict laboratory disciplines.

Theoretically, there is a possibility, even if very low, of particle transfer or contamination between tubes stored in liquid nitrogen. In order to eliminate this risk, equipped healthcare centers apply a special safety protocol for the materials of patients carrying infections. To prevent contact with the cells of healthy individuals, completely separate, specially labeled, and isolated liquid nitrogen tanks are allocated for individuals with viral infections such as Hepatitis B. Even the carrier compartments inside the devices are different. Thanks to this strict safety barrier, the genetic materials of all patients can be preserved safely for many years without any risk of transmission.

How Are Hepatitis B Screenings Planned in Couples Who Want to Have Children?

One of the most important stages for couples who are about to begin the process of having a child is a detailed and comprehensive preparation process. In order to achieve a safe pregnancy, the overall infection status of both the male and female partner must be carefully mapped. Many different parameters, from the amount of virus circulating in the blood to the level of liver fatigue, are evaluated simultaneously. Some of the basic serological tests requested from the male and female partner before treatment are as follows:

• HBsAg
• Anti-HBs
• Anti-HBc
• HBV DNA
• AST
• ALT
• Anti-HIV
• Anti-HCV

If the female partner has previously received the Hepatitis B vaccine and the amount of protective antibodies in her blood is above a certain level, the theoretical possibility of the virus being transmitted from her partner to her disappears. This greatly facilitates the planning of the treatment process and allows couples to go through this period with a much more comfortable state of mind. The interpretation of all these tests and the planning of additional vaccinations when necessary require the joint work of multiple medical disciplines.

How Do Active and Inactive Hepatitis B Carriage Change the Treatment Process?

In individuals who apply with the desire to have a child, whether the Hepatitis B infection is in an “active” or “inactive” phase is the most decisive factor in determining the medical roadmap to be followed. Inactive carriage refers to the silent period in which the virus is present in the body but remains dormant, does not replicate, and does not damage the liver. To prove this condition, the viral load in the patient’s blood must remain below a certain threshold and the liver enzymes must stay within normal limits for a long period. In patients confirmed to be inactive carriers, it is possible to begin reproductive treatments directly without an additional waiting period, provided that appropriate laboratory precautions are taken.

However, if test results show that a high amount of virus is circulating in the blood (active replication) and that liver enzymes are elevated, indicating cellular damage, the process takes on an entirely different dimension. Starting reproductive treatments during such an active period with high inflammation creates a disadvantage in terms of the quality of the cells to be obtained and also puts the patient’s general health at risk. In this scenario, the first goal is to start antiviral medication treatment, place the virus into a dormant state, and secure liver functions. After the inflammation in the body subsides and test values begin to normalize, reproductive treatments can be started safely.

How Is Mother-to-Baby Transmission of the Hepatitis B Virus Prevented?

One of the issues families are most concerned about regarding Hepatitis B is the possibility of the virus being transmitted to the baby during pregnancy or at the time of birth. If the expectant mother is a carrier of the virus and the viral load in her blood is high, the risk of the baby becoming infected during birth is quite high if no protective measures are taken. Modern medicine has developed highly effective protective shields to manage this high risk.

The most important stage of this protective shield begins not during pregnancy but in the first hours after birth. Every baby born to an infected mother is given a special immune serum containing ready-made defensive antibodies (immunoglobulin) and the standard Hepatitis B vaccine simultaneously within those critical first hours following birth. Ready-made soldiers that neutralize the virus are given through one arm, while through the other arm the baby’s own immune system is taught to recognize the virus and produce a defense. This dual protection strategy reduces the likelihood of the virus settling in the baby’s liver to an extraordinary degree. Moreover, after these vaccinations and protective serums are administered, there is no medical obstacle to the mother breastfeeding her baby. When the correct steps are taken on time, there is no risk of transmitting the infection to the baby through breastfeeding.

Frequently Asked Questions

Prof. Dr. Berkan Reşorlu

Prof. Dr. Berkan Reşorlu, born in Ankara in 1979, completed his medical education at Ankara University between 1997 and 2003, and his specialization in urology at Ankara University Faculty of Medicine between 2003 and 2008. Academically, he received the title of associate professor in 2013 and professor in 2022.

He has conducted extensive case series studies in the field of endoscopic stone surgery, contributed surgeries performed on children under the age of 1 to the literature, and has gained international recognition with his stone scoring system and experimental surgical models.