Internal Fire? Why Trichomoniasis Stings & Your Medical Next Steps

If you're feeling burning, irritation, or unusual discharge "down there," it can feel like an internal fire you can't ignore. One possible cause is trichomoniasis—a very common, treatable sexually transmitted infection (STI). While the symptoms can be uncomfortable and sometimes alarming, the good news is that trichomoniasis is usually straightforward to diagnose and cure with the right medication.

Let's walk through what trichomoniasis is, why it can sting or burn, and what you should do next.

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What Is Trichomoniasis?

Trichomoniasis (often called "trich") is a sexually transmitted infection caused by a microscopic parasite called Trichomonas vaginalis. It spreads primarily through sexual contact, including vaginal intercourse.

According to major public health authorities like the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO):

• Trichomoniasis is one of the most common non-viral STIs worldwide.
• Many people who have it don't know it.
• It is treatable and curable with prescription medication.

Because symptoms aren't always obvious, it can spread unknowingly between partners.

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Why Does Trichomoniasis Feel Like an "Internal Fire"?

The burning or stinging sensation associated with trichomoniasis happens because the parasite irritates the lining of the genital tract.

Here's what's happening inside the body:

• The parasite infects the vaginal or urethral lining.
• It triggers inflammation.
• The irritated tissue becomes more sensitive.
• Urine passing over inflamed tissue can cause burning.
• Friction during sex may worsen discomfort.

This inflammation is what creates the sensation of:

• Vaginal burning
• Itching
• Pain with urination
• Pain during sex
• General irritation

The discomfort can range from mild to intense. Some people describe it as rawness or a constant stinging feeling.

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Common Symptoms of Trichomoniasis

Symptoms usually appear within 5 to 28 days after exposure, but many people never develop noticeable signs.

In Women, Symptoms May Include:

• Frothy, yellow-green, gray, or white vaginal discharge
• Strong or unusual vaginal odor
• Vaginal itching or irritation
• Burning during urination
• Pain during sex
• Redness or soreness of the genital area

In Men, Symptoms May Include:

• Burning after urination or ejaculation
• Mild discharge from the penis
• Irritation inside the penis
• Increased urinary urgency

Many men have no symptoms at all, which increases the risk of unknowingly passing the infection to partners.

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When Trichomoniasis Has No Symptoms

Up to 70% of infected people may have minimal or no symptoms. That means you can:

• Feel completely normal
• Still carry the parasite
• Still pass it to someone else

Because of this, testing is essential if you:

• Have a new sexual partner
• Have multiple partners
• Notice any unusual genital symptoms
• Have been told a partner tested positive

If you're experiencing burning, discharge, or discomfort and want to better understand what might be causing it, try this free AI-powered trichomoniasis symptom checker to see if your symptoms align with this common STI and get personalized guidance on your next steps.

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Is Trichomoniasis Dangerous?

Trichomoniasis is treatable, but leaving it untreated can lead to complications.

Potential Risks of Untreated Trichomoniasis:

• Increased risk of contracting or spreading HIV
• Pelvic inflammatory disease (rare but possible)
• Complications during pregnancy (including preterm delivery)
• Persistent genital inflammation

While these risks are real, most people who get treated early recover fully without long-term problems.

The key is not ignoring symptoms.

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How Is Trichomoniasis Diagnosed?

Diagnosis is usually simple and quick.

A healthcare provider may:

• Perform a pelvic exam
• Take a vaginal or penile swab
• Test a urine sample
• Use a laboratory test called a nucleic acid amplification test (NAAT), which is highly accurate

Testing is often available at:

• Primary care clinics
• Gynecology offices
• Sexual health clinics
• Urgent care centers

You do not need to feel embarrassed—healthcare providers handle these concerns every day.

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Treatment: How to Stop the Burning

The standard treatment for trichomoniasis is prescription antibiotics, most commonly:

• Metronidazole
• Tinidazole

These medications are typically taken as:

• A single large dose
  or
• A smaller dose taken twice daily for 7 days

Your doctor will decide which option is best for you.

Important Treatment Notes:

• Both you and your sexual partner(s) must be treated.
• Avoid sex until treatment is complete and symptoms are gone.
• Do not drink alcohol while taking metronidazole or tinidazole (this can cause severe nausea and vomiting).
• Even if symptoms disappear quickly, complete the full treatment course.

Most people notice improvement within a few days.

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What If Symptoms Come Back?

Reinfection is common if partners are not treated.

If symptoms return:

• Get retested.
• Make sure all recent partners received treatment.
• Avoid sexual activity until cleared by a doctor.

In some cases, repeat treatment may be necessary.

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When to Seek Immediate Medical Care

While trichomoniasis itself is usually not life-threatening, seek urgent care if you experience:

• Severe lower abdominal pain
• Fever
• Fainting or dizziness
• Heavy bleeding
• Signs of a severe allergic reaction to medication

These symptoms could signal a more serious condition that needs immediate evaluation.

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How to Reduce Your Risk

Prevention matters.

You can lower your risk of trichomoniasis by:

• Using condoms consistently and correctly
• Limiting the number of sexual partners
• Having open conversations about STI testing
• Getting regular STI screenings if sexually active

Routine testing is especially important because many infections are silent.

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The Bottom Line

If it feels like there's an internal fire—burning, itching, stinging—trichomoniasis could be the cause. The irritation happens because a parasite inflames sensitive tissue in the genital tract.

Here's what to remember:

• It's common.
• It's treatable.
• It can be silent.
• Early care prevents complications.

Do not ignore persistent burning, discharge, or discomfort. If you're wondering whether your symptoms could be trichomoniasis, start by checking your symptoms with a free AI tool designed to help you understand your condition better and make informed decisions about seeking care.

Most importantly, speak to a doctor if you suspect an STI or if your symptoms are severe, persistent, or worsening. Some infections and complications can become serious if left untreated. A healthcare professional can give you a clear diagnosis and the right treatment so you can move forward confidently and safely.

You don't need to panic—but you do need to act.