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
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.
Sources
Last updated 2026-11-12.