Quick read
Key points
- 1
Threadworms are small, thin, white parasitic worms that live in the gut and are a very common cause of itching around the bottom, particularly worse at night when female worms lay eggs on the skin. They're especially common in young children and spread easily within households.
- 2
Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
- 3
Symptoms don't improve after treatment
01 · Know
What is Threadworms?
Threadworms are small, thin, white parasitic worms that live in the gut and are a very common cause of itching around the bottom, particularly worse at night when female worms lay eggs on the skin. They're especially common in young children and spread easily within households.
Infection happens by swallowing microscopic eggs, often from contaminated hands or surfaces, and while unpleasant, threadworms are harmless and straightforward to treat with medication available from a pharmacy.
02 · Understand
Clinical context
Self-care advice
Speak to your pharmacist for advice on suitable treatment, or your GP if a child is under two or if symptoms persist.
03 · Act
When to see a doctor
- 1Symptoms don't improve after treatment
- 2You're unsure whether symptoms are due to threadworms or another cause
- 3A child under two years old has symptoms, as treatment recommendations differ
- 4You're pregnant or breastfeeding and need advice on safe treatment
- 5Symptoms keep recurring despite treating the whole household
04 · Prevent & manage
Practical steps
Take these self-care steps
These measures can help ease symptoms, support recovery, and reduce the chance of things worsening — but they don't replace medical advice if symptoms are severe or persistent.
- 1Treat the whole household together.Since threadworms spread easily, treating everyone in the household at the same time helps prevent reinfection.
- 2Practise strict hygiene for two weeks.Wash hands and scrub under nails regularly, especially after using the toilet and before eating, to break the cycle of reinfection.
- 3Wash bedding, nightwear, and towels.A hot wash on the day treatment starts helps remove any eggs present.
- 4Keep nails short and discourage nail-biting.This reduces the chance of eggs being transferred from the bottom to the mouth.
- 5Vacuum and clean surfaces thoroughly.This can help remove any eggs from the home environment during treatment.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- HSE: Threadworms ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
Threadworms are common, harmless, and easily treated with medication from a pharmacy, combined with careful household hygiene for two weeks.
Treating the whole household at the same time, alongside strict hygiene, is key to breaking the cycle of reinfection.