Epididymitis Symptoms: Causes, Treatment, and When to See a Doctor

A sudden ache or heaviness in the scrotum is the kind of symptom most men hope will just go away on its own. Often it’s nothing serious, but when the discomfort builds over a day or two and comes with swelling, fever, or pain that gets worse rather than better, epididymitis symptoms are one of the most common explanations — and one that responds well to the right treatment once it’s correctly identified. Here’s what actually causes it, how to recognize it, and when it’s worth getting checked out right away.

What the Epididymis Does and What Goes Wrong

The epididymis is a tightly coiled tube that sits along the back of each testicle. Its job is to store sperm after it’s produced and to carry it toward the vas deferens, the tube that eventually transports sperm during ejaculation. Because it’s a relatively narrow, enclosed structure, it’s vulnerable to infection and inflammation — and when that happens, the surrounding tissue often becomes swollen, tender, and increasingly painful over the course of a day or two. This is epididymitis. In many cases, the infection starts elsewhere — in the urethra, the bladder, or the prostate — and travels down into the epididymis, which is why urinary symptoms often show up alongside the testicular ones.

What Causes Epididymitis

The underlying cause tends to differ by age and risk factors, which is part of why doctors ask fairly detailed questions before settling on a treatment plan:

• Sexually transmitted infections. In sexually active men under about 35, chlamydia and gonorrhea are the most frequent causes. These infections can travel from the urethra into the epididymis, sometimes without causing obvious urethral symptoms first.
• Urinary tract bacteria. In older men, young boys, and men who have sex with men, bacteria more typically associated with urinary tract infections — especially E. coli — are a more common cause. These infections often start in the bladder or prostate and spread downward.
• An enlarged prostate. Benign prostatic hyperplasia (BPH) can make it harder to fully empty the bladder, which raises the risk of urinary bacteria backing up and reaching the epididymis. Men already dealing with BPH symptoms have a somewhat higher baseline risk for this reason.
• Recent catheter use or urologic surgery. A urinary catheter gives bacteria a more direct path into the urinary tract, and recent prostate or bladder procedures carry a similar, usually temporary, increase in risk.
• Less common infectious causes. Tuberculosis and certain other bacteria, including Ureaplasma, can cause epididymitis in rarer cases, particularly in men with weakened immune systems or in parts of the world where TB is more common.
• Medication-related causes. The heart rhythm medication amiodarone has been linked to a non-infectious form of epididymitis in some patients, usually resolving once the dose is adjusted or the medication is changed under a doctor’s guidance.

It’s worth noting that epididymitis itself is not contagious in the way a cold is — you can’t catch inflammation of the epididymis from someone else. But when it’s caused by a sexually transmitted infection, that underlying infection can be passed to a sexual partner, which is why partner testing and treatment matter when an STI is identified as the cause.

Symptoms to Watch For

Epididymitis symptoms typically build gradually over a day or two, which is one of the clues doctors use to distinguish it from more sudden-onset problems. Common symptoms include:

• A dull ache or feeling of heaviness in one testicle, often the first sign
• Gradually increasing pain and tenderness, sometimes spreading to involve the whole testicle
• Swelling and redness of the scrotum on the affected side
• Low-grade fever and chills
• Pain or burning during urination
• Urethral discharge
• Blood in the semen
• A tender lump near the testicle
• Discomfort in the lower abdomen or pelvic area
• Pain during ejaculation, or pain that worsens with bowel movements, in some cases

On examination, a doctor may find a red, tender, swollen area along the back of the affected testicle, sometimes with enlarged lymph nodes in the groin. If the prostate is involved, a prostate exam may reveal tenderness there as well.

Epididymitis vs. Testicular Torsion: Why the Difference Matters

One of the most important distinctions in scrotal pain is between epididymitis, which develops gradually and is treated with antibiotics, and testicular torsion, a true surgical emergency where the testicle twists on its blood supply. Torsion typically causes sudden, severe, one-sided pain — often within minutes rather than building over a day — and can occur at any age, though it’s most common in adolescents and young men. Because torsion cuts off blood flow to the testicle, it generally needs surgical correction within about six hours to prevent permanent damage. If pain comes on suddenly and intensely rather than gradually, or if you’re ever unsure which you’re dealing with, treat it as an emergency and seek immediate care — a Doppler ultrasound in the emergency department can usually tell the two apart quickly.

How Epididymitis Is Diagnosed

Diagnosis usually starts with a physical exam and a conversation about recent sexual activity, urinary symptoms, and any recent procedures or catheter use. From there, a doctor may order:

• Urinalysis and urine culture. To check for bacteria and white blood cells suggesting infection, sometimes collected before and after a prostate massage to pinpoint where the infection is coming from.
• Chlamydia and gonorrhea testing. Typically done with a urine sample or urethral swab, especially in younger, sexually active men.
• Doppler ultrasound. This imaging test checks blood flow to the testicle, which helps confirm epididymitis and rule out torsion, since the two can look similar in their early stages.
• Blood tests. A complete blood count can help confirm there’s an active infection or inflammation.

Treatment Options

Most cases of epididymitis are treated effectively with a course of antibiotics, chosen based on the most likely cause:

• Antibiotics for STI-related cases. When chlamydia or gonorrhea is the likely or confirmed cause, antibiotics target both, and sexual partners from the past 60 days are typically advised to get tested and treated too, even without symptoms, to prevent reinfection.
• Antibiotics for urinary-source cases. When the cause is more likely urinary bacteria, a different antibiotic course is used, often for a somewhat longer duration, particularly in older men or those with an underlying urinary tract issue.
• Pain and anti-inflammatory medication. Over-the-counter options like ibuprofen can help manage pain and swelling alongside antibiotics.
• Rest, elevation, and ice. Lying down with the scrotum supported and elevated, along with an ice pack wrapped in a cloth (never applied directly to skin), can meaningfully ease discomfort in the first few days.
• Supportive underwear. A snug-fitting athletic supporter can reduce movement and discomfort while the inflammation settles.
• Adjusting amiodarone, if applicable. For the rare cases linked to this heart medication, a cardiologist’s guidance is needed before making any changes.

Most men start to feel meaningfully better within a few days of starting antibiotics, though some swelling and tenderness can linger for a few weeks even after the infection has cleared. A follow-up visit is often recommended to confirm the infection has fully resolved, particularly when an STI was the cause.

What Happens If Epididymitis Goes Untreated

Left untreated, epididymitis can lead to more serious complications, which is why it’s worth seeing a doctor promptly rather than waiting to see if symptoms resolve on their own:

• Abscess formation. A pocket of infected fluid can develop in the scrotum, sometimes requiring drainage.
• Chronic epididymitis. Ongoing, low-level inflammation and discomfort that can persist for months.
• Testicular infarction. In severe, prolonged cases, blood flow to the testicle can be compromised enough to damage the tissue.
• Fertility effects. Severe or repeated infections can, in some cases, affect sperm production or block sperm transport on the affected side, though this is uncommon when the infection is treated promptly.

The encouraging news is that most men who get treated promptly recover completely, with no lasting effect on fertility or sexual function.

Lowering Your Risk

A few practical steps can meaningfully lower the odds of developing epididymitis, particularly for men with known risk factors:

• Practicing safer sex. Condom use and open communication with partners about STI testing reduce the risk of the sexually transmitted infections that commonly cause epididymitis.
• Treating urinary symptoms promptly. Don’t ignore burning with urination, urgency, or other signs of a urinary tract infection — treating these early can prevent the infection from spreading downward.
• Managing an enlarged prostate. If BPH is making it hard to fully empty your bladder, talking with a doctor about treatment options can reduce the risk of urinary bacteria building up.
• Good catheter care. For men who use a catheter regularly, following proper hygiene guidance from a healthcare provider reduces infection risk.

When to See a Doctor

Scrotal pain is one symptom worth taking seriously rather than waiting out. See a doctor promptly, or go to urgent care or an emergency room, if you notice:

• Sudden, severe, one-sided testicle pain, especially if it comes on within minutes rather than building over hours or days — this needs emergency evaluation to rule out testicular torsion
• Testicle pain accompanied by fever, chills, or a new lump
• Pain that’s steadily worsening rather than improving over a day or two
• Visible swelling, redness, or warmth of the scrotum
• Urethral discharge or blood in the semen
• Pain that doesn’t improve within a few days of starting antibiotics

When in doubt, it’s always reasonable to get scrotal pain checked out quickly — a same-day evaluation is standard practice for this kind of symptom precisely because the two most common causes (infection and torsion) require very different, and very prompt, responses.

Frequently Asked Questions

Can epididymitis go away without antibiotics?

Mild inflammation unrelated to infection may occasionally resolve on its own, but most cases of epididymitis are caused by bacteria and need antibiotics to fully clear. Without appropriate treatment, the infection can worsen or lead to complications like abscess or chronic inflammation, so it’s not something to simply wait out.

Is epididymitis the same as a testicular infection?

They’re closely related but not identical. Epididymitis specifically involves the epididymis, the tube behind the testicle. When the infection spreads to involve the testicle itself, the condition is called epididymo-orchitis. Both are treated similarly, typically with antibiotics.

How long does epididymitis take to heal?

Most men notice significant improvement in pain and fever within 48 to 72 hours of starting antibiotics, though full resolution of swelling and tenderness can take two to four weeks. Chronic cases, while less common, can take longer and sometimes need a different treatment approach.

Can epididymitis affect fertility?

A single, promptly treated episode rarely has a lasting effect on fertility. Repeated or severe untreated infections carry a higher risk of scarring that can affect sperm transport, which is part of why timely treatment matters, especially for men who haven’t completed their families.

Does epididymitis always mean an STI?

No. While STIs are the leading cause in younger men, epididymitis in older men, young boys, and men with urinary tract risk factors is more often caused by non-sexually transmitted bacteria. A doctor can usually tell which is more likely based on age, symptoms, and test results, and will test for STIs when appropriate rather than assuming either way.

This article is for general educational purposes and isn’t a substitute for personalized medical advice. Scrotal pain can have several causes that require different urgent responses, so always have new or worsening symptoms evaluated by a doctor.

Epididymitis is uncomfortable, but it’s also one of the more straightforward urological conditions to treat once it’s correctly identified — antibiotics, rest, and a bit of patience resolve the large majority of cases without lasting effects. The one thing worth remembering is the urgency distinction: gradually worsening discomfort over a day or two is typical of epididymitis, while sudden, severe, one-sided pain needs emergency evaluation. When in doubt, getting it checked out quickly is always the right call.