Men, don’t ignore this swelling: It could affect your fertility, doctors warn

Imagine your body sending you urgent text messages through physical signals and one of those alerts could be testicular swelling or noticeable changes in size, heaviness, warmth or discomfort in one or both testicles. While you might shrug it off as a minor irritation from sports, lifting or just life, medical research suggests it is worth paying attention to because some causes do intersect with fertility.

In an interview with the Times of India, Dr Prajakta Chaudhary, Fertility Specialist at Nova IVF Fertility in Mumbai's Andheri explained, "Testicular swelling means enlargement or a change in size of one or both testicles. It may occur suddenly or gradually, leading to pain, discomfort, or a heavy feeling. Swelling can be caused by infections, fluid accumulation, injury, or sometimes more serious health conditions. While not all swelling means infertility, ignoring it can delay treatment and increase risks."




Talking about the causes, she revealed that infections such as epididymitis, orchitis and sexually transmitted infections (STIs) can cause inflammation and swelling. Dr Chaudhary elaborated, "Having a hydrocele, a fluid-filled sac around the testicle. A varicocele is an enlarged vein in the scrotum, a major cause of male infertility. An inguinal hernia, which is a part of the intestine, pushes into the scrotum, causing swelling. Trauma or injury due to sports or accidents can damage the testicles. Testicular torsion is a medical emergency where the spermatic cord twists and cuts off the blood supply. Tumours are a rare cause, but they can also lead to testicular swelling."

Varicocele: A common cause of swelling and fertility decline

One of the most studied links between testicular swelling and fertility is a condition called varicocele or enlargement of veins in the scrotum (think of it as varicose veins below the belt). A report by World Health Organization, revealed, “Varicocele was found in 25.4% of men with abnormal semen, compared with 11.7% of men with normal semen… accompanied by decreased testicular volume, impaired sperm quality… and decline of Leydig cell secretion.”

This landmark WHO-associated study shows that men with varicocele are much likelier to have compromised sperm quality, smaller testicular volume and hormonal changes linked to infertility. The takeaway from it is that varicocele is not just swelling, it is a well-documented contributor to male infertility.

Systematic reviews further supports this. Varicoceles are associated with significant decreases in sperm concentration and motility compared with men without this condition. Highlighting the warning signs, Dr Chaudhary said, "The symptoms seen in men are pain, redness, warmth, sudden enlargement, heaviness in the scrotum, fever, pain during urination, or visible veins. Painless swelling should also be checked, as it may be a sign of varicocele or a tumour."

Swelling from infection or blockage can affect fertility too

Not all swelling stems from varicocele. Some infections and fluid collections around the testicle, like hydrocele or epididymo-orchitis, can disrupt the environment where sperm develop. According to the study, Infertility secondary to an infected hydrocele: A case report, published in Urology Case Reports, “Bilateral hydroceles… were found in a man with severe oligospermia… and at 18 months post bilateral hydrocelectomy, the patient’s total sperm count improved to 43 Million/ml… recommending considering hydrocele as an etiology in any patient with idiopathic infertility.”

While hydroceles are usually painless and don’t always harm fertility, this case shows that infected or severe fluid buildup can impact sperm count and reverses with treatment. This highlights the importance of clinical evaluation for swelling, especially when fertility is a concern.

Why swelling is not just cosmetic: Inflammation and semen quality

Dr Chaudhary warned, "If left untreated, testicular swelling can lead to long-term damage. Complications seen in men can be chronic pain, reduced sperm production, poor sperm quality, blocked sperm pathways, hormone imbalance, and, in severe cases, loss of the testicle (as in torsion). Some infections can permanently damage the reproductive organs if treatment is delayed. Hence, men are required to take charge of their reproductive health and act without any further delay."

Conditions that cause testicular swelling (like varicocele, infection, torsion or trauma) often involve inflammation, altered blood flow, heat stress or oxidative damage. These biological states are proven to interfere with normal sperm development and function.

The study, Scrotal and testicular conditions, in PubMed review found that some varicoceles are associated with impaired fertility, probably due to an increase in scrotal temperature that leads to testicular hyperthermia, oxidative stress and reduced spermatogenesis. This review explains how certain swelling-related conditions create environments (heat, oxidative stress, inflammation) that reduce sperm production and quality, the very foundations of fertility.

So, is testicular swelling a sign of infertility?

Dr Chaudhary answered, "Not every case of testicular swelling causes infertility but some conditions strongly affect reproductive health. Varicocele can reduce sperm count and quality. Infections can block sperm flow or damage sperm-producing cells. Torsion can permanently harm the testicle if not treated quickly. Long-term swelling can disrupt testosterone production, affecting fertility and sexual function. Men, make sure to pay attention to your testicular health and consult a fertility expert for timely help. Ignoring testicular health is a strict no-no and can land you in a grave problem. So, be safe instead of sorry."

Take-home message

If you notice swelling, pain, heaviness, or changes in your testicles, don’t wait. A fertility specialist or urologist can assess and, in many cases, treat the underlying issue before long-term effects take hold. Early evaluation can be the difference between treatment success and missed opportunity.

Dr Chaudhary concluded with the advice, "Testicular swelling should never be ignored. Many causes are treatable, especially when diagnosed early. Men with concerning symptoms such as swelling, pain, or changes in testicle size should see a fertility consultant and you will surely be able to overcome the challenges."

Note: The information provided in this article is for educational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional before starting any new medication or treatment and before changing your diet or supplement regimen.