Threadworms are tiny parasitic worms (also called pinworms) that live in the human gut and around the anus, most often in children but adults can get them too.

Quick Scoop: What are threadworms?

  • Threadworms are small, thin, white worms that look like bits of cotton or white thread, usually 2–13 mm long.
  • Their scientific name is Enterobius vermicularis , and they are a type of slender nematode (roundworm).
  • They live in the intestines, and at night the female worms crawl out around the anus to lay microscopic eggs, which causes intense itching.
  • The infection is very common, especially in school‑age children, and usually isn’t dangerous but is uncomfortable and easily spreads through a household.

How they spread (in simple terms)

  • The worms lay eggs around the anus at night; the eggs irritate the skin and make it very itchy.
  • Scratching the area gets eggs on the fingers and under fingernails; these can then get onto toys, bedding, clothes, food, and surfaces.
  • When someone puts their fingers in their mouth or eats food contaminated with eggs, they swallow the eggs; these hatch in the gut and the cycle starts again.

Think of it as a “scratch → eggs on hands → eggs in mouth → new worms in gut” loop.

Common symptoms

  • Itchy bottom, especially at night or shortly after going to bed.
  • You might see thin, white, thread‑like worms in poo or around the anus.
  • Disturbed sleep, irritability, sometimes mild tummy pain or reduced appetite.
  • In girls, itching can also affect the vulva or vaginal area and cause frequent trips to the toilet.

Basic treatment and prevention (high level only)

  • Threadworms are usually treated with a short course of worm medicine such as mebendazole, and everyone in the household is often treated at the same time.
  • Good hygiene is crucial: regular handwashing, keeping nails short, daily bathing, changing underwear and bedlinen, and cleaning high‑touch surfaces and toys.

If you think you or a child might have threadworms, it’s best to speak with a pharmacist or doctor for proper diagnosis and treatment advice.

Information gathered from public forums or data available on the internet and portrayed here.