Left Testicle Pain: Causes & When to See a Doctor

Pain in your left testicle can be scary and confusing, especially if you’re not sure what’s causing it. While left testicle pain can stem from something minor, like a strain or temporary irritation, it can also signal a more serious condition that needs medical attention. This guide will help you understand the possible causes of left testicle pain, what to watch for, and when to see a healthcare provider.

Key Takeaways

• Pain in the left testicle has many causes, ranging from muscle strain and infections to structural issues and emergencies. (Healthline)

• Not all testicle pain is testicular cancer, but changes in how your testicle feels—especially lumps or persistent swelling—should always be checked out. (Mayo Clinic)

• Seek help promptly if the pain is sudden, severe, lasts more than a day, or comes with other symptoms like fever or nausea. (Cleveland Clinic)

What Is Left Testicle Pain?

Left testicle pain refers to discomfort, soreness, or sharp pain in the left testicle or scrotum. This pain may be constant, intermittent, dull, or sharp. Some men feel discomfort only during activity, while others notice it even at rest. Pain may also radiate to the groin or lower abdomen.

Left testicle pain isn’t unusual—many conditions can affect one side without involving the other. The left testicle is slightly more prone to certain issues like varicoceles (enlarged veins), and conditions affecting blood flow or inflammation can manifest more on one side. (Healthline)

Common Causes of Left Testicle Pain

Varicocele

A varicocele occurs when veins in the scrotum become enlarged, similar to varicose veins in the legs. This can cause a dull ache or feeling of heaviness, especially after standing or physical activity. It’s a relatively common cause of left-sided pain. (Mayo Clinic)

Epididymitis and Orchitis

Inflammation of the epididymis (a coiled tube behind the testicle) is called epididymitis and is a frequent source of testicle pain in adults. Infection can lead to swelling and tenderness in the scrotum. If the testicle itself becomes inflamed, that’s orchitis. Both conditions may be caused by bacterial infections, including sexually transmitted infections (STIs). (Mayo Clinic)

Testicular Torsion — A Medical Emergency

This condition happens when the spermatic cord twists and cuts off blood flow to the testicle. It causes sudden, severe pain and swelling and is a true emergency—you need immediate medical care to save the testicle. (Wikipedia)

Injury or Trauma

Direct blows, sports injuries, or strains can result in pain that might show up hours or even days later. While many injuries resolve with rest and ice, any serious blow should be evaluated if pain persists. (Cleveland Clinic)

Hydrocele and Spermatocele

Fluid buildup around the testicle (hydrocele) or cysts on the epididymis (spermatocele) can sometimes cause discomfort or a feeling of fullness. These are often benign but worth mentioning to your doctor if they change or cause pain. (Healthline)

Referred Pain

In some cases, pain felt in the testicle may originate from another area, like the groin or lower back. Conditions such as hernias or kidney stones can cause radiating discomfort. (Cleveland Clinic)

Testicular Cancer

While testicular cancer more commonly presents as a painless lump or swelling, some people may experience discomfort or pain alongside other symptoms. Any change in size, firmness, or texture of the testicle—not just pain—should prompt evaluation. (Mayo Clinic)

Assess Your Symptoms: When to Worry

Not all testicle pain requires emergency care—but some signs mean you should seek immediate help:

• Sudden, severe pain lasting more than an hour. (Cleveland Clinic)

• Swelling, redness, or warmth to the touch. (Healthline)

• Pain accompanied by nausea, vomiting, fever, or chills. (Cleveland Clinic)

• A hard lump or noticeable change in testicle size or shape. (Mayo Clinic)

• Pain that doesn’t improve or gets worse over a few days. (Cleveland Clinic)

When in doubt, it’s better to talk to a healthcare provider. A physical exam, ultrasound, or other tests can help pinpoint the cause. (Cleveland Clinic)

Final Thoughts

Left testicle pain can be unsettling, but in many cases, it’s caused by treatable conditions. The key is paying attention to your symptoms and acting early if something feels off. Understanding common causes and red flags empowers you to take control of your health—and get the care you need when it matters most.