Why Does My Left Testicle Hurt When I Sit? 5 Common Causes

Experiencing a sharp pain in left testicle when sitting can be uncomfortable—and sometimes alarming. The good news is that many causes are treatable and not life-threatening. That said, testicular pain should never be ignored, especially if it comes on suddenly or severely.

Below are five of the most common reasons your left testicle may hurt when you sit, what they feel like, and when to seek medical care.

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1. Testicular Torsion (A Medical Emergency)

Testicular torsion happens when the spermatic cord twists, cutting off blood flow to the testicle. This is a medical emergency that requires immediate treatment—usually surgery—within hours to prevent permanent damage.

Symptoms:

• Sudden, severe sharp pain in left testicle when sitting or standing
• Swelling or redness of the scrotum
• Nausea or vomiting
• One testicle sitting higher than the other
• Abdominal pain

Sitting may increase pressure in the groin area, making the pain feel worse.

If your pain started suddenly and is intense, do not wait. Seek emergency medical care immediately.

If you're experiencing sudden testicular pain and want to quickly assess whether your symptoms could indicate this serious emergency, Ubie offers a free AI-powered Testicular Torsion symptom checker that takes just minutes to complete and provides personalized guidance—though this should never delay seeking emergency care if symptoms are severe.

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2. Epididymitis (Inflammation or Infection)

Epididymitis is inflammation of the epididymis—the coiled tube behind the testicle that stores sperm. It's one of the most common causes of testicular pain in men and often affects just one side.

Common causes:

• Bacterial infections
• Sexually transmitted infections (such as chlamydia or gonorrhea)
• Urinary tract infections

Symptoms:

• Gradual onset of pain (not usually sudden)
• Tenderness in the back of the testicle
• Swelling
• Burning with urination
• Possible fever

You may notice sharp pain in left testicle when sitting, especially if pressure is applied to the inflamed area. Sitting for long periods can aggravate the discomfort.

Epididymitis is usually treated with antibiotics. Early treatment reduces the risk of complications.

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3. Varicocele (Enlarged Veins in the Scrotum)

A varicocele is a group of enlarged veins within the scrotum—similar to varicose veins in the leg. It most commonly occurs on the left side due to differences in vein anatomy.

Why it hurts when sitting:

Sitting can increase pressure in the pelvic and groin veins, which may worsen discomfort.

Symptoms:

• Dull, aching pain that may become sharp
• Heaviness in the scrotum
• Pain that worsens after long periods of sitting or standing
• Visible or palpable "bag of worms" feeling

While varicoceles are often harmless, they can affect fertility in some men. If the pain persists or worsens, a doctor may recommend imaging tests or treatment options.

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4. Inguinal Hernia

An inguinal hernia occurs when part of the intestine pushes through a weak spot in the abdominal wall and into the groin.

Signs to watch for:

• Bulge in the groin area
• Pain or pressure that worsens when sitting, bending, or lifting
• A dragging sensation in the scrotum
• Occasional sharp pain in left testicle when sitting

The pain happens because sitting increases abdominal pressure, which pushes more tissue into the hernia space.

Small hernias may only cause mild discomfort. Larger or painful hernias often require surgical repair. If the pain becomes severe or the bulge becomes firm and cannot be pushed back in, seek urgent care.

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5. Referred Pain (From Back, Nerves, or Kidneys)

Not all testicle pain starts in the testicle.

The nerves supplying the testicles originate in the lower back and abdomen. Problems in these areas can send pain signals to the scrotum.

Possible sources:

• Lower back strain
• Herniated disc
• Kidney stones
• Pinched nerve

If your sharp pain in left testicle when sitting is accompanied by:

• Lower back pain
• Pain radiating down the leg
• Flank pain (side of abdomen)
• Blood in urine

Then the cause may be outside the scrotum itself.

Treating the underlying condition usually resolves the testicular discomfort.

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When Is Left Testicle Pain Serious?

While many causes are treatable, certain symptoms require immediate medical care:

• Sudden, severe pain
• Swelling that develops quickly
• Nausea or vomiting with pain
• Fever with scrotal tenderness
• Pain after injury
• Pain lasting more than a few hours without improvement

Sudden pain is especially concerning for torsion. Time matters—waiting can result in permanent damage or loss of the testicle.

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Why Sitting Makes It Worse

You might wonder why the pain specifically happens when sitting.

Sitting can:

• Increase pressure in the groin and pelvic veins
• Compress inflamed tissues
• Reduce blood flow temporarily
• Put strain on the lower back and nerves
• Tighten clothing against sensitive areas

If sitting triggers discomfort, try:

• Wearing supportive underwear
• Avoiding tight pants
• Using a cushioned seat
• Taking breaks to stand and move
• Applying a cold pack (wrapped in cloth) for short periods

These steps may reduce mild pain but should not replace medical evaluation if symptoms persist.

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How Doctors Diagnose the Cause

If you see a healthcare provider, they may:

• Perform a physical exam
• Order a scrotal ultrasound (very common and painless)
• Test urine or blood
• Screen for infections

Ultrasound is especially helpful to rule out torsion, infection, or blood flow problems.

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Final Thoughts: Don't Ignore Ongoing Testicle Pain

A sharp pain in left testicle when sitting can range from minor irritation to a medical emergency. The key factors are:

• How suddenly the pain started
• How severe it is
• Whether other symptoms are present

Mild discomfort that improves may not be urgent—but ongoing, worsening, or sudden severe pain should always be evaluated.

If you're uncertain about the cause of your symptoms or want to better understand your risk level before seeing a doctor, you can check your symptoms using Ubie's free Testicular Torsion assessment tool. And most importantly:

Speak to a doctor immediately if you suspect anything serious or life-threatening.

When it comes to testicular health, acting early can make all the difference.