Testicular swelling

Overview

Testicular swelling is when one or both testicles become larger, fuller, or feel different than usual. It can happen with or without pain and may be caused by many different conditions, from harmless fluid buildup to more serious problems that need prompt treatment.

Testicular swelling is relatively common, especially in young and middle-aged men. Many men will experience some form of scrotal swelling at some point in their lives.

It affects males of all ages, from newborns to older adults. Different causes are more common at different ages. For example, hydrocele is common in infants, while testicular torsion is more common in teenagers and young adults. Epididymitis occurs more often in sexually active men.

Symptoms

Common symptoms

• Swelling or enlargement of one or both testicles
• Heaviness or a pulling sensation in the scrotum
• Dull ache or discomfort in the lower belly or groin
• Change in the shape or feel of the testicle

Symptoms in children

• A painless lump or swelling in the scrotum (common with hydrocele or hernia)
• Crying or fussiness if the swelling is painful
• Sudden severe pain with nausea or vomiting – this can be testicular torsion

Symptoms in older adults

• Gradual swelling that is often painless (may be hydrocele)
• Discomfort that worsens with activity or standing
• Redness or tenderness if infection is present

Causes

Main causes

• Epididymitis – inflammation of the tube that carries sperm, often due to infection
• Orchitis – inflammation of the testicle itself, sometimes caused by the mumps virus
• Hydrocele – a buildup of fluid around the testicle that is usually harmless
• Varicocele – enlarged veins in the scrotum, similar to varicose veins in the leg
• Inguinal hernia – part of the intestine pushes into the scrotum through a weak spot in the groin muscle
• Testicular torsion – the spermatic cord twists, cutting off blood supply to the testicle (emergency)
• Testicular cancer – a lump or swelling caused by abnormal cell growth

Risk factors

• Being between 15 and 35 years old (for testicular torsion and testicular cancer)
• Unprotected sex with multiple partners (risk of sexually transmitted infections that can cause epididymitis)
• Previous testicular injury or surgery in the groin area
• Family history of testicular cancer or undescended testicle (cryptorchidism)
• Not being vaccinated against mumps (mumps can cause orchitis)

When to see a doctor

See a doctor urgently if:

• If you have sudden, severe testicular pain – this could be testicular torsion, which needs surgery within hours.
• If your scrotum is red, hot, and very tender, or if you have a fever – this may be a serious infection.
• If the swelling happened after a major injury to the groin.

Book a routine appointment if:

• If you notice any new lump or swelling that lasts more than a few days, even if it does not hurt.
• If you have a persistent dull ache or discomfort in the testicle or lower belly.
• If the swelling changes in size or feel over time.

Diagnosis

Your doctor will ask about your symptoms and medical history, and then examine your testicles and scrotum. They may also check your abdomen and groin for signs of hernia or enlarged lymph nodes.

Tests that may be done

• Ultrasound scan of the scrotum – this is the main test to see the testicles, blood flow, and any fluid or lumps. It is painless and uses sound waves.
• Urine test – to check for infection or blood.
• Blood tests – may be done to check for signs of infection or, if cancer is suspected, tumour markers.

What to expect at your appointment

The exam is quick and usually done in your doctor's office. You may feel mild discomfort, but it should not be painful. The doctor will explain what they are doing. If an ultrasound is needed, a gel is applied to your scrotum and a small wand is moved over the area.

Treatment

Treatment depends entirely on the underlying cause. Many cases are managed with rest and simple measures, while infections need antibiotics. More serious conditions like testicular torsion or cancer require surgery.

Self-care at home

• Rest and support the scrotum with snug-fitting underwear or an athletic supporter.
• Apply an ice pack wrapped in a cloth to the area for 15 minutes at a time to reduce swelling (never ice directly on skin).
• Avoid heavy lifting, strenuous exercise, or activities that worsen the pain.
• If the cause is a minor injury, take over-the-counter pain relief according to the package instructions (ask your pharmacist for advice).

Medical treatments

For infections, your doctor will prescribe antibiotics or antiviral medicines. For inflammation without infection, anti-inflammatory medicines may be recommended. Hydroceles often go away on their own, but if large or bothersome, a doctor can drain the fluid with a needle. Varicoceles that cause pain or fertility issues may be treated with surgery to tie off the affected veins.

When is surgery considered?

Surgery is needed for testicular torsion (as soon as possible to save the testicle), for inguinal hernias that cause symptoms or are at risk of strangulation, and for removal of a testicle (orchidectomy) if testicular cancer is found. In some cases, a hydrocele may be surgically removed if it keeps coming back.

Living with this condition

Most men with testicular swelling can continue their normal activities once the cause is identified and treated. Follow your doctor's advice about recovery time, especially after surgery. Check your testicles regularly and report any new changes to your doctor.

Lifestyle tips

• Practice safe sex to reduce the risk of infections that can cause epididymitis.
• Wear protective gear during contact sports to prevent injury.
• Avoid straining during bowel movements if you have a hernia or varicocele.

Diet and exercise

A balanced diet rich in fruits, vegetables, and lean protein supports overall health and healing. Gentle walking is usually fine, but avoid heavy lifting or high-impact exercise until your doctor says it's safe. If you have surgery, follow specific activity restrictions.

Mental health and emotional wellbeing

It is normal to feel anxious or worried about testicular swelling, especially because it can be linked to cancer or fertility. Talk openly with your doctor or a counsellor. Partners and close friends can also be a source of support.

Prevention

Not all causes can be prevented, but you can lower your risk. Practice safe sex to avoid STIs that cause epididymitis. Get vaccinated against mumps (MMR vaccine) to prevent mumps-related orchitis. Avoid activities that could injure the groin.

Vaccines

The MMR (measles, mumps, rubella) vaccine can prevent mumps and the testicular swelling that sometimes comes with it. This vaccine is part of routine childhood immunisation in many countries, including the UK.

Screening programmes

There is no routine screening programme for testicular cancer, but self-exams are recommended. Get to know what your testicles normally feel like so you can notice any changes early. See your doctor if you find any lump or swelling.

Complications

If left untreated

• Testicular torsion can lead to permanent damage or loss of the testicle if not treated within hours.
• An infection that is not treated may spread to the bloodstream (sepsis) or to other parts of the body.
• A hernia that becomes strangulated can cut off blood supply to the intestine, which is life-threatening.
• Testicular cancer can spread to other organs if not caught early.

Long-term outlook

The outlook is very good for most causes of testicular swelling. With prompt diagnosis and proper treatment, the majority of men recover fully and have no long-term problems. Even testicular cancer has a high cure rate when found early. The key is not to delay seeking medical advice.

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