When should I see a doctor about one testicle getting smaller?

When Should You Be Concerned About One Testicle Getting Smaller?

It’s common for men to notice that one testicle hangs slightly lower or feels a bit smaller than the other. In most cases, mild asymmetry isn’t a sign of anything serious—every body is different. However, a noticeable change in size—especially if it happens suddenly or is accompanied by pain—can signal an underlying issue that deserves medical attention. Below, we explain:

• How aging affects testicle size
• Possible causes of a noticeably smaller testicle
• Warning signs that mean you should see a doctor
• What to expect during a medical evaluation

Is One Testicle Smaller in Old Age?

As men get older, it’s normal for testicles to undergo subtle changes:

• Testosterone levels gradually decline after age 30–40.
• Reduced hormone production can lead to mild testicular atrophy (shrinkage).
• Blood flow to the scrotum may slow down, altering size or firmness.
• Previous minor injuries or bouts of inflammation (even without noticeable symptoms at the time) can leave lasting effects.

Most of these changes are gradual and painless. If you’ve noticed a slight difference over many years, it’s probably just part of the normal aging process. Still, any new or rapid change warrants a closer look.

Common Causes of One Testicle Shrinking

1. Varicocele

   • Enlarged veins in the scrotum that can impair blood flow.
   • Often described as a “bag of worms” feeling above the testicle.
   • Can slowly reduce testicular size on the affected side.

2. Epididymitis or Orchitis

   • Inflammation of the epididymis (tube behind the testicle) or the testicle itself.
   • Usually caused by bacterial infections, including sexually transmitted infections.
   • May lead to temporary swelling followed by shrinkage once inflammation subsides.

3. Testicular Torsion

   • A medical emergency where the spermatic cord twists, cutting off blood supply.
   • Sudden, severe scrotal pain and swelling are hallmarks.
   • If not treated within 6–8 hours, the testicle can sustain permanent damage and shrink.

4. Trauma or Injury

   • A direct hit or crushing injury can damage tissue and blood vessels.
   • Bruising and swelling may resolve, but scar tissue can lead to long-term size reduction.

5. Hormonal Disorders

   • Conditions like Klinefelter syndrome affect testicular development and function.
   • Lowered testosterone production can contribute to smaller testicle size.

6. Past Surgery or Radiation

   • Procedures such as hernia repair can inadvertently affect testicular blood flow.
   • Radiation therapy for cancer in the pelvic area may lead to gradual shrinkage.

7. Tumors or Cancer

   • Rarely, a tumor can change the shape or size of one testicle.
   • Usually accompanied by a lump, heaviness, or mild discomfort.

When to See a Doctor

Most minor asymmetries don’t require medical care. But make an appointment if you experience any of the following:

• Sudden or severe pain in one testicle
• Rapid change in size (shrinking or swelling) over days or weeks
• A new lump, nodule, or area of firmness
• Redness, warmth, or signs of infection
• Fever, chills, or flu-like symptoms
• Blood in your semen or urine
• Difficulty urinating or a burning sensation
• Erectile dysfunction or noticeable drop in sex drive
• Concerns about fertility or family planning

How Doctors Evaluate Testicular Changes

When you see a urologist or primary care doctor, here’s what usually happens:

1. Medical History

   • Discussion about onset, duration, and any triggers (trauma, infection).
   • Questions about sexual history, urinary symptoms, and overall health.

2. Physical Exam

   • Palpation of both testicles to compare size, shape, and tenderness.
   • Examination of the groin area for hernias or enlarged lymph nodes.

3. Ultrasound Imaging

   • A painless, noninvasive test using sound waves to view blood flow and tissue structure.
   • Helps distinguish between fluid collections (hydrocele), varicoceles, masses, or torsion.

4. Laboratory Tests

   • Blood work to check hormone levels (testosterone, LH, FSH).
   • Urine analysis or swabs if infection is suspected.

5. Additional Studies

   • In rare cases, CT or MRI scans if an abdominal or pelvic condition is suspected.
   • Semen analysis for fertility concerns.

Treatment Options

• Varicocele: Conservative management (scrotal support, anti-inflammatories) or surgical repair (“varicocelectomy”)
• Infections: Antibiotics and anti-inflammatory medications
• Torsion: Emergency surgery to untwist the cord and restore blood flow
• Hormonal Imbalances: Testosterone replacement therapy, if appropriate
• Trauma: Rest, ice, scrotal support; surgery if there’s significant internal damage
• Tumors: Surgical removal, possibly followed by chemotherapy or radiation

Preventing Further Testicular Problems

• Wear protective gear during sports or risky activities
• Practice safe sex to reduce infection risk
• Perform monthly self-exams to monitor for lumps or changes
• Maintain a healthy weight and manage chronic conditions (diabetes, high blood pressure)
• Avoid excessive heat exposure (hot tubs, laptops on lap)

Check Your Symptoms Online—Free and Doctor-Approved

If you’re unsure whether your symptoms warrant a doctor’s visit, consider doing a free, online symptom check, using the doctor-approved Ubie Symptom Checker. It can help you decide how urgently to seek care and what questions to ask your provider.

When to Seek Immediate Care

Some situations are potentially life threatening or could cause permanent damage. Call 911 or go to the nearest emergency department if you have:

• Sudden, excruciating scrotal pain
• Nausea and vomiting with testicular pain
• Signs of testicular torsion (rapid swelling, high-riding testicle)
• Heavy bleeding or clear trauma to the groin

Speak to a Doctor

While many causes of testicular shrinkage are benign or easily treated, you shouldn’t ignore new or worrisome symptoms. If you notice a rapid change in size, persistent pain, lumps, or any other alarming signs, schedule an appointment with your doctor or urologist. Your health and well-being are too important to leave to chance.