Hydrocele in Men: Symptoms, Causes, and Dealing With Scrotal Swelling

A hydrocele is a type of swelling in the scrotum that occurs when fluid collects in the thin sheath surrounding a testicle. In the UK, this is a common condition that can affect males at any age, though it is frequently seen in infants or men over the age of 40.

Under normal circumstances, the testicles descend from the abdomen into the scrotum during development, accompanied by a small amount of natural lubricating fluid. Usually, this fluid is absorbed by the body. A hydrocele forms when the body either fails to absorb this fluid or produces an excess amount, leading to a visible and palpable enlargement of the scrotal sac. While a hydrocele is typically painless and non-cancerous, the change in appearance or the sensation of heaviness often leads men to seek medical advice.

The primary sign of a hydrocele is a painless swelling of one or both testicles. For adult men, the sensation is often described as a feeling of 'heaviness' in the scrotum. Because the fluid accumulates slowly, the swelling may not be noticed immediately.

• Painless swelling: Unlike some other testicular issues, a hydrocele usually does not hurt.
• Fluctuation in size: The swelling may seem smaller in the morning and larger after a day of physical activity.
• Heaviness: As the volume of fluid increases, the weight can cause discomfort in the groin area.
• Redness or Pressure: In rare cases, if the hydrocele becomes very large, the skin may feel tight or look slightly red.

It is important to note that while the hydrocele itself is painless, the underlying cause—such as an infection or minor injury—might be associated with some discomfort. NHS guidance emphasizes that any new lump or swelling in the scrotum should be checked by a GP promptly.

In adult men, hydroceles develop for different reasons than they do in babies. While a newborn's hydrocele is usually due to a communication with the abdominal cavity that hasn't closed yet, adult cases are generally classified as 'acquired'.

Inflammation and Infection

Inflammation of the testicle (orchitis) or the small, coiled tube at the back of the testicle (epididymitis) can stimulate the production of excess fluid. This is often linked to common infections, including some sexually transmitted infections (STIs).

Injury or Trauma

A direct blow to the scrotum or a sports-related injury can lead to fluid accumulation as the body's inflammatory response to the trauma.

Fluid Imbalance

In some cases, the lymphatic system responsible for draining fluid from the area may not work efficiently, leading to a slow buildup over several months or years. Often, no specific cause is found, and the condition is labelled as 'idiopathic'.

Diagnosis by a healthcare professional is straightforward and usually involves a physical examination. During an in-person or initial online assessment, a doctor will ask about the history of the swelling and any associated symptoms like pain or urinary changes.

Physical Exam: The GP will feel the scrotum to check for tenderness and to determine the location of the fluid. They will also check for signs of an inguinal hernia, which can sometimes mimic the appearance of a hydrocele.

Transillumination: This is a classic diagnostic technique where a bright light is shone through the scrotum. Because a hydrocele is filled with clear fluid, the light will pass through, making the scrotum appear to glow. If the mass was solid (like a tumour), the light would not pass through.

Ultrasound Scan: If there is any doubt about the diagnosis or if the GP cannot feel the testicle properly due to the volume of fluid, they may refer you for a scrotal ultrasound. This uses sound waves to create an image of the internal structures and is the 'gold standard' for ruling out testicular cancer or other pathologies, in line with NICE guidelines.

In many cases, a hydrocele does not require active treatment. If it is small, painless, and not causing functional problems, a 'watch and wait' approach is often adopted. Many hydroceles in adults disappear on their own within six months.

Surgical Intervention (Hydrocelectomy)

If the hydrocele is large, causing significant discomfort, or affecting your self-esteem, surgery may be recommended. This is usually a day-case procedure performed under general or local anaesthetic. A small incision is made in the scrotum or groin to drain the fluid and remove or repair the sac to prevent recurrence.

Aspiration and Sclerotherapy

For men who are not fit for surgery, a needle can be used to drain the fluid (aspiration). However, the fluid almost always returns. To prevent this, a 'sclerosing' agent can be injected to scar the sac shut, though this is less common than surgery in the UK due to a higher risk of recurrence and infection.

If you have noticed a change in the shape or size of your scrotum, it is natural to feel anxious. Speaking to an online doctor in the UK can be an excellent first step in managing your health from the privacy of your home.

A GP consultation online allows you to discuss your symptoms in detail. You can describe the onset, the presence of any pain, and any other relevant medical history. The doctor can provide a clinical opinion on the likelihood of a hydrocele and, crucially, advise you on whether you need an urgent physical examination or an ultrasound referral. In the UK, online services can often provide quicker access to advice than waiting for a routine local appointment, helping to ease your mind or set you on the right path for specialist care.

While an online doctor cannot perform transillumination, they can triage your symptoms effectively and provide the necessary documentation or referral letters to ensure you receive the correct NHS or private diagnostic tests.