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Hydrocele

Also called: Hydrocele, fluid around testicle

A painless swelling of the scrotum from fluid around a testicle. Common in newborns and usually harmless.

Common inNewborns, older men
UsuallyPainless
NewbornsOften goes away by age 1

Overview

In adults it can follow injury or infection.

Sudden pain is not a hydrocele and needs emergency care.

A hydrocele feels like a smooth, water-filled swelling around the testicle. A light shined through it glows.

In babies, it may change size during the day if it connects to the belly (communicating hydrocele).

Symptoms

Common signs:

  • Painless scrotal swelling

Less common

  • Heaviness

When to get medical care

Call 911Sudden, severe testicle pain (possible torsion).
Get care todaySwelling with pain or fever.
See a doctor soonNew swelling.

Causes

Fluid buildup.

Does it spread or run in families?

  • It isn't contagious. You can't catch it from someone else.

Who is more likely to get it

  • Newborns

Diagnosis

A clinician examines.

The exam

Shining a light through the scrotum.

Tests

Tests, if needed:

  • Ultrasound:

Treatment

Watch it.

Self-care

  • Supportive underwear
  • Use supportive underwear

Surgery if large or bothersome.

Prevention

To lower your risk or prevent problems:

  • Protect the groin in sports

Which doctor treats this

  • Start with your primary care provider (family doctor or internist).
  • They may send you to a urologist (urinary tract doctor).

Children, pregnancy, and older adults

  • Babies: Many go away by age 1.

Outlook

Harmless.

Surgery cures large or lasting hydroceles.

Getting ready for your visit

Bring a list of your symptoms and medicines.

Questions to ask

  • Does it need surgery?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Hydrocele

Sources

Last updated 2026-11-12.