Hydrocele vs Varicocele: Identifying Scrotal Swelling and Seeking UK Treatment

Discovering a lump or swelling in the scrotum can be a source of significant anxiety for men. However, the majority of scrotal swellings are non-cancerous. Two of the most common benign conditions are hydroceles and varicoceles. While they both involve the scrotum, their causes, symptoms, and impacts on health differ considerably.

In the UK, NHS guidance suggests that any change in the shape or feel of the testicles should be reviewed by a doctor. Understanding the clinical features of these conditions helps patients provide better information when they speak to a GP online or in person, ensuring a faster pathway to diagnosis and appropriate management.

A hydrocele is a type of swelling in the scrotum that occurs when fluid collects in the thin sheath surrounding a testicle. This is common in newborns but can develop in older children and adults due to inflammation or injury within the scrotum.

Symptoms of a Hydrocele

• Painless swelling: Usually, the main symptom is a painless, enlarged scrotum.
• Feeling of heaviness: As the hydrocele grows, it may cause a dragging sensation.
• Transillumination: A characteristic feature is that if a light is held against the scrotum, it will glow (transilluminate), indicating the swelling is composed of clear fluid.

Most hydroceles in adults are not dangerous and may not require treatment unless they become so large that they cause physical discomfort or embarrassment.

A varicocele is an enlargement of the veins within the loose bag of skin that holds your testicles (scrotum). These veins are known as the pampiniform plexus. A varicocele is very similar to a varicose vein you might see in a leg.

Symptoms of a Varicocele

• The 'Bag of Worms': The most common description is a mass that feels like a bunch of worms above the testicle.
• Dull ache: Some men experience a dull, recurring ache, especially after standing for long periods or during hot weather.
• Shrinkage (atrophy): The affected testicle may eventually appear smaller than the other.
• Fertility issues: Varicoceles are a known cause of low sperm production and decreased sperm quality, which can cause infertility.

Varicoceles are more common on the left side of the scrotum due to the anatomical pathway of the left testicular vein.

Telling the difference between these two conditions is usually straightforward for a clinician. A hydrocele involves fluid around the testicle and often feels smooth and tense. In contrast, a varicocele involves the veins and feels lumpy or thickened.

Position also matters. A hydrocele typically surrounds the testicle, making it difficult to feel the testicle itself if the swelling is large. A varicocele is usually found above the testicle and often becomes less noticeable when you lie down, as the blood drains out of the enlarged veins.

NICE (National Institute for Health and Care Excellence) guidelines for scrotal swellings emphasise the importance of a physical examination. During a consultation, a GP will check for tenderness and use a light to see if the swelling is fluid-filled.

If the diagnosis is unclear, or if the doctor cannot clearly feel the testicle behind the swelling, a scrotal ultrasound is typically ordered. This is a painless scan that uses sound waves to create a clear image of the internal structures, allowing the clinician to definitively distinguish between a hydrocele, a varicocele, a cyst, or a solid mass.

If you notice any new lump, heaviness, or change in the size of your scrotum, you should speak to a GP online for an initial assessment. An online doctor can discuss your symptoms, review your medical history, and provide guidance on the next steps.

Accessing a private GP online can be a quick way to get professional reassurance or a referral for a private ultrasound scan if you are concerned about waiting times. While an online doctor cannot perform a physical palpation, they can triaging your symptoms and advise whether your condition requires urgent or routine investigation based on British clinical standards.

Treatment is not always necessary for either condition. If a hydrocele is small and painless, a 'watch and wait' approach is common. If it is large, a minor surgical procedure called a hydrocelectomy may be performed to remove the fluid sac.

For varicoceles, treatment is usually only recommended if there is significant pain, testicular atrophy, or if a couple is struggling with infertility. The two main procedures are:

• Varicocele embolisation: A radiologist uses a catheter to block the enlarged veins.
• Surgical ligation: A surgeon ties off the affected veins to redirect blood flow into healthy veins.