Threadworms

Also called Pinworms or Enterobius

Threadworms are tiny white worms that live in the gut and lay eggs around the bottom, usually at night. They are very common, especially in children, and spread easily when eggs are swallowed after being picked up on fingers, bedding, towels or toys.

Last updated Nov 9, 2026

What it is

Everyone in the household should be treated at the same time, usually with a single dose of medicine, sometimes repeated after 2 weeks.

Strict hygiene for 6 weeks helps stop reinfection: washing hands, keeping nails short, washing bedding and towels and showering in the morning.

Common signs

  • Extreme itching around the bottom, especially at night
  • Disturbed sleep
  • Seeing tiny white worms in poo or around the bottom
  • Itching around the vagina in girls

How it is usually diagnosed

  • Seeing the worms
  • Sometimes a sticky tape test around the bottom

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • GP or pharmacy notes
  • Prescriptions

Questions to ask your doctor

  • Who in the household needs treatment?
  • Is the treatment safe in pregnancy or for young children?
  • How do we stop them coming back?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Severe tummy pain, or blood in poo: see a doctor the same day

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources