Threadworms
Threadworms are tiny white worms that live in the bowel, and are very common in children, though anyone can get them. They are harmless, but the itching around the bottom can be unpleasant. They are easy to treat, and the whole household usually needs treating at the same time.
- Common in
- Children (spread easily in families)
- Treatment
- A single-dose medicine plus hygiene
- Hygiene steps
- Keep going for at least 2 weeks
Common signs
- Itching around the anus (bottom), especially at night
- Tiny white threads, up to about 1 cm long, in poo or around the bottom
- Disturbed sleep and irritability in children
- In girls and women, sometimes itching around the vagina
How they spread
Threadworm eggs are tiny and can be picked up on fingers, then swallowed. Scratching the itchy area leaves eggs under the fingernails, which then spread on surfaces, toys, clothes and bedding. That is why the whole household is at risk.
Treatment
A pharmacist can recommend a treatment, usually a single dose of a medicine, taken by everyone in the household who is old enough. It is not suitable for everyone — for example it is not suitable for children under 2, and pregnant or breastfeeding women should ask a pharmacist or doctor first. In those cases, hygiene measures alone may be advised.
Hygiene steps that make a difference
- Wash your hands with soap and water, and scrub under the nails, after using the toilet or changing nappies, and before eating or preparing food.
- Keep fingernails short, and try not to scratch or suck fingers.
- Have a bath or shower every morning, washing the bottom and genital area to remove eggs laid overnight.
- Wash bedding, night clothes and towels on a hot wash after treatment, and vacuum and damp-dust the bedroom.
- Continue these steps for at least 2 weeks after treatment.
- Children with threadworms do not need to stay off school or nursery.
How PRX Pharmacy can help
Our pharmacists can recommend the right treatment for each person in your household, check it is safe, and explain what to do.
When to get medical help
Contact your GP practice or call 111 the same day if:
- • It is a child under 2 years old
- • You are pregnant or breastfeeding and the itching is troubling you
- • The symptoms have not gone after treatment plus 2 weeks of the hygiene steps
- • You have severe tummy pain, blood in your poo, or unexplained weight loss
- • You have a weakened immune system
If you are ever worried and unsure, ask us or call 111. Trust your instincts — it is always better to ask.
This guide is general information written by the PRX Pharmacy team. It does not replace advice from a pharmacist or doctor who knows your medical history.
Last updated 24 September 2026. Clinically reviewed by Milan Patel, Pharmacist on 24 September 2026.
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