Trichomoniasis: Causes, Symptoms, Diagnosis, and Treatment

Trichomoniasis is a common sexually transmitted infection caused by the microscopic parasite called Trichomonas vaginalis settling in the reproductive and excretory systems. Its symptoms include stinging during urination, uncomfortable itching in the genital area, and abnormally colored discharge; however, the disease may progress silently in many individuals without causing any complaints. Trichomoniasis treatment is successfully carried out not with externally applied creams but with special oral antibiotics used simultaneously by partners. Early diagnosis of this condition, which can deeply affect reproductive health, and bringing it under control with the correct medications play a critical role in preventing anatomical problems that may occur in the future.

What Is Trichomoniasis and Which Microorganism Causes It?

The main source of this condition is a microscopic organism known in the medical world as “Trichomonas vaginalis.” This organism is neither a virus nor a bacterium; in terms of cellular structure, it is a single-celled and flagellated type of parasite. This organism, whose ability to survive for a long time outside the human body is quite limited, has evolved specifically to settle in the reproductive and excretory systems of humans. This parasite, which prefers moist, warm, and dark environments, survives by attaching to the tissues of the urogenital system through specific proteins.

The functioning of the infection at the cellular level is quite interesting. After attaching to the body’s own cells, the parasite does not merely remain in that area; it actively secretes chemical substances that damage the surrounding tissues. More importantly, it feeds by virtually engulfing beneficial bacteria, red blood cells, and defense cells around it. As we will discuss in later sections, this tendency to engulf also poses a serious threat to male reproductive cells. The destruction caused by the parasite due to its structure lays the groundwork for microscopic inflammation in the tissues.

The main characteristics of this infection are as follows:

• Single-celled structure
• Flagellated mobility
• Ability to live only in humans
• Requirement for a moist environment

Through Which Routes Is Trichomoniasis Transmitted?

There are many misconceptions in society about the transmission routes of the disease. The spread of the disease mainly occurs through unprotected sexual contact. Direct contact of infected genital fluids with the urogenital tissues of a healthy individual is sufficient for the parasite to find a new host. This transmission most commonly occurs during vaginal intercourse. When the parasite reaches the new tissue, it quickly moves with the help of its flagella and settles on the inner surface of the urinary canal or other reproductive organs.

People generally wonder whether such conditions are transmitted through shared public areas. The parasite’s survival time in external environments outside the human body, on dry surfaces, or at different temperatures is extremely short. Once outside the body, it dries out and loses its viability within minutes. Because of this fragile structure, the possibility of indirect transmission is considered clinically almost impossible. Nevertheless, certain prejudices and reservations in society may cause people to blame different places as the source of transmission.

The main routes of transmission of the disease are as follows:

• Unprotected vaginal intercourse
• Contact with infected body fluids
• Shared sexual materials

Common misconceptions in society, meaning situations in which transmission is not expected, are as follows:

• Using shared toilets
• Swimming pools
• Using shared towels
• Door handles
• Bathhouses or saunas

How Common Is Trichomoniasis in Türkiye and Around the World?

The prevalence of this infection is much higher than commonly thought. It ranks among the most common non-viral sexually transmitted diseases worldwide. Large-scale regional and national health screenings conducted in our country provide quite clear data on the prevalence of the disease. In the general population, the rate of encountering this parasite is around five to six percent on average. When the distribution between genders is examined, it is noteworthy that the incidence in women is somewhat higher than in men. However, this does not mean that men become ill less often; the greater difficulty of diagnosis in men is one of the main reasons for this statistical difference.

When examined regionally, different prevalence rates are observed across different geographical areas. For example, while this rate may exceed eight percent in some regions, the figures can reach much more dramatic levels in certain risk groups or individuals with gynecological complaints. Sociodemographic habits also play a determining role at this point. Hygiene practices in daily life, bathing habits, and even the types of underwear preferred may have indirect effects on the processes of the infection settling in or being eliminated from the body. It is thought that non-cotton, non-breathable synthetic clothing increases moisture in the area and provides a more livable environment for the parasite.

Some daily habits that increase risk factors are as follows:

• Use of synthetic underwear
• Insufficient genital hygiene
• Frequent partner changes
• Failure to use protection methods

Why Does Trichomoniasis Usually Progress Without Symptoms in Men?

The most confusing aspect of this condition in male patients is that the vast majority of infected individuals feel nothing. The person continues daily life completely normally and experiences no pain or difference. The reason behind this is the unique chemical and anatomical structure of the male urogenital system. Male genital secretions, especially the fluids produced by the prostate gland, provide a highly challenging living environment for parasites.

Prostatic fluid naturally contains a high amount of zinc. In addition, the oxidative nature of these fluids is quite high. Although zinc is a very beneficial mineral for human health, it acts almost like a toxic substance for this type of single-celled parasite. When the parasite enters the male body, it encounters this strong chemical barrier in the urinary canal and prostate region. Even if the body cannot completely eliminate the parasite, it suppresses its reproduction and prevents it from reaching enormous numbers that would damage the tissues. Because the number of parasites remains low, a severe inflammatory response does not occur in the body; therefore, warning signs such as pain, burning, or discharge do not arise.

However, this situation is actually a major disadvantage. Since the patient believes there is no problem, he continues his daily life and sexual routine. This silent carriage causes the infection to be transmitted unknowingly to other people. Even worse, these organisms living silently inside begin to damage reproductive cells over time.

The natural factors that suppress symptoms in the male body are as follows:

• High zinc levels in prostatic fluid
• The flushing pressure of the urinary canal
• The dense structure of genital secretions
• Anatomical barriers

Does Trichomoniasis Damage Sperm and Cause Infertility?

The most concerning aspect of the disease is its insidious effects on reproductive health. When this parasite, which does not cause a visible complaint, is examined in a laboratory environment, it is understood to pose a real threat to sperm cells. When the parasite advances from the urinary tract toward the ducts where sperm are produced and transported, it begins to disrupt the delicate balance there.

First of all, the parasite’s method of feeding is dangerous for sperm cells. This organism, which breaks down surrounding cells in order to survive, can also directly damage sperm cells. However, the parasite’s main destructive effect occurs through certain harmful proteins that it secretes into the environment. These proteins disrupt the signals that maintain the life cycle within sperm cells. Because of these chemical signals, a healthy sperm cell enters the process of premature aging and self-destruction (apoptosis). As a result, semen quality gradually decreases. In laboratory analyses, very clear losses in quality are observed in the sperm tests of individuals carrying the infection.

The main deteriorations in sperm quality are as follows:

• Decrease in total cell count
• Reduction in forward movement ability
• Structural abnormalities in cell shape
• Decrease in the proportion of live sperm
• Increase in inflammatory cells in semen
• Decrease in semen volume

These changes can make it quite difficult to have children naturally. Especially in cases of unexplained male infertility, the presence of such a silent infection in the background should definitely be kept in mind.

With Which Complaints and Symptoms Does Trichomoniasis Manifest in Men?

When the body’s defense mechanism is insufficient to suppress the parasite or the infection becomes more severe, the disease breaks its silence and certain disturbances begin to appear in the lower urinary tract. These symptoms are generally not very severe and may be interpreted by the patient as “a mild chill” or “irritation” and ignored.

The most common condition encountered is inflammation of the urinary canal. While urinating during the day, the person may describe a slight ache, burning, or needle-pricking sensation inside the canal. Even apart from urination, mild tingling, itching, and discomfort may be experienced at the tip of the penis. Another notable moment is during ejaculation. During or immediately after the passage of semen through the canal, an uncomfortable pain or stinging sensation may be felt in the area. This indicates irritation in the prostate and sperm ducts.

The most concrete symptom that can be physically noticed is discharge. Although this discharge may not be noticed much during the day, it typically appears as one or two drops at the tip of the penis, especially upon waking in the morning before going to the toilet. The color and consistency of the discharge may provide clues about the severity of the infection; although it is generally clear and mucus-like, it may turn white, yellow, or green as the degree of inflammation increases.

The most commonly observed clinical complaints are as follows:

• Burning during urination
• Itching at the tip of the penis
• Clear discharge before the first morning urination
• Stinging during ejaculation
• Frequent urge to urinate

What Are the Differences Between Trichomoniasis and Gonorrhea?

One of the most important steps in urological evaluations is to correctly determine which microorganism is causing the complaints. The condition of individuals presenting with discharge and burning in the urinary canal is often confused with the disease commonly known as “gonorrhea.” Gonorrhea is an infection caused by a different bacterium and has a much more pronounced course.

In gonorrhea, complaints begin very suddenly and are quite severe. Patients feel unbearable pain during urination, almost like being cut by glass. The accompanying discharge does not consist of only a few drops expected in the morning; it continues throughout the day and has a very dense, thick, and purulent structure. Its color is generally dark yellow or cream. On the other hand, the parasitic infection discussed here begins much more insidiously and slowly. The discharge is more transparent, the amount is small, and the pain level is more like an uncomfortable ache. However, it is not possible to make a clear distinction based only on what the patient describes or the color of the discharge; different infections may often occur together.

The clear differences between the two diseases are as follows:

• Color and density of the discharge
• Severity of the pain
• Speed at which the complaints begin
• Frequency of discharge during the day

Which Urological Problems May Occur If Trichomoniasis Is Left Untreated?

When mild symptoms are not taken seriously or incorrect medications are used based on hearsay information, the infection cannot be completely eliminated from the body. This problem, which begins at the tip of the urinary canal, gradually starts to progress deeper into the canal, toward the bladder, prostate gland, and areas around the testicles. This backward spread lays the groundwork for more complex disease patterns that seriously threaten urological health.

One of the most common complications is chronic inflammation of the prostate gland. When the parasite settles in the prostate ducts, it creates persistent sensitivity in the area. The person begins to feel constant fullness, heaviness, and pain in the pelvic region, testicles, and the area between the anus and testicles. This condition, which seriously reduces quality of life, may also negatively affect sexual functions over time.

Another important risk area is the epididymis, the structure located just above the testicles where sperm are stored and mature. When inflammation reaches this area, sudden severe pain, swelling, redness, and increased warmth are observed in the scrotum. If the condition is not treated, the infection may deepen further and lead to the accumulation of pus in the sac (abscess). In addition, constantly recurring urinary tract inflammations may create permanent scars and hardening on the inner surface of the canal, causing narrowing of the urinary canal. Urethral stricture is a condition whose treatment is quite difficult and requires patience.

Secondary problems that may occur over time are as follows:

• Persistent inflammation in the prostate gland
• Testicular and epididymal infections
• Narrowing of the urinary canal
• Sexual dysfunctions
• Blockage in sperm-carrying ducts

How Do Urology Specialists Diagnose Trichomoniasis?

Diagnosing the disease requires special attention because the number of parasites is generally low in men. The process first begins with a detailed physical evaluation. The external genital organs are examined, and the lymph nodes in the groin area are checked for any swelling. When necessary, more detailed examinations may be performed to understand the condition, size, and sensitivity of the prostate gland. Through a method called prostate massage, inflammatory fluids in the prostate can be made to flow into the urinary canal, and this fluid can then be examined.

Since visual examination alone is not sufficient, laboratory tests are used. Appropriate samples taken from the patient are of great importance. Most commonly, the sediment obtained by concentrating the first morning urine in centrifuge devices, prostatic fluid, semen samples, or swab samples taken from the urinary canal with a special stick are used. In previous years, these samples were examined under a microscope in an attempt to observe moving parasites. However, because these organisms rapidly lose their movement and change shape when removed from the male body, detecting them under the microscope is quite difficult.

Today, molecular technologies are used for diagnosis. Genetic amplification tests known as PCR are the most reliable method in diagnosing the disease. This test works by detecting the hereditary codes, namely the DNA, of the parasite, even when present in numbers too low to be seen under a microscope. Its margin of error is quite low, and it can also reveal the presence of other hidden infections at the same time. If it is suspected that the infection has spread to other organs such as the testicles or kidneys, imaging methods such as ultrasonography may also be included in the diagnostic process.

The basic tools used in the diagnostic process are as follows:

• Detailed genital examination
• First morning urine analysis
• Examination of prostatic fluid
• Urinary tract swab test
• Genetic DNA (PCR) tests
• Imaging methods

How Is Trichomoniasis Treated and What Should Be Considered?

It is possible to completely eliminate the disease from the body, but for this, the correct medication must be used for the correct duration. Externally applied creams, ointments, or soaps are of no use in treatment because the problem lies deep within the organs. Therefore, the use of systemic medications taken orally and distributed throughout the entire body is a medical necessity. A specific group of antibiotics is preferred in treatment. Depending on the condition of the disease and the patient’s characteristics, a high-dose pill treatment taken in a single dose may be administered, or sometimes a longer medication program lasting ten to fourteen days and divided into doses may be planned.

There are very strict rules that patients must follow during this treatment process. Alcohol consumption is the foremost among them. The active ingredients in the medications used in treatment temporarily stop the function of certain enzymes in the liver. If the patient consumes alcohol while using this medication, the alcohol cannot be broken down in the body and turns into a toxic substance. As a result, severe nausea, heart palpitations, facial flushing, low blood pressure, and unbearable headaches occur. Therefore, alcohol must be completely avoided, including for several days after the treatment ends.

Another critical factor that ensures the treatment is permanent is simultaneous treatment. The disease is generally present in both partners, but only one may show symptoms. If only the person with complaints is treated, the disease will be transmitted back from the partner during the first contact after recovery. To break this vicious cycle, partners must begin treatment on the same day whether or not they have complaints and must avoid contact throughout the treatment period.

The steps that must be followed for a healthy recovery process are as follows:

• Using the medications at the dose recommended by the physician
• Completely avoiding alcohol throughout treatment
• Including the partner in treatment at the same time
• Avoiding sexual contact until recovery is complete
• Performing follow-up tests after treatment
• Consulting a physician without delay in suspicious situations

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.