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Threadworms, also known as pinworms, are the most common form of worm infection in the UK and are particularly common amongst young children under the age of 10. Threadworm infections are generally caused by poor hygiene – not washing your hands after using the toilet (or touching/scratching the anal area) results in threadworm eggs being stuck under the fingernails and being passed on to anything you touch.

These tiny parasitic worms infect and hatch eggs in the large intestine of humans. They resemble a tiny piece of white thread, approximately one centimetre in length and can be visible around the anus or vaginal area and also in the stools.


Threadworms do not always cause symptoms but the most common is itchiness around the bottom (or vaginal area in girls). This can lead to interrupted sleep due to discomfort and irritability.

More severe threadworm infections can cause skin infection around the anus from where bacteria has been able to enter the raw, scratched skin. Loss of appetite and subsequently weight loss are also symptoms attributed to severe or persistent threadworm infections. In extreme and rare cases it has been known for threadworms to spread beyond the large intestine and nest in other places, such as the urinary tract, liver and for women, in the vagina. If any of these symptoms are present you should see your GP for treatment.



Usually threadworm, or pinworm, can be diagnosed and treated at home, using medicines available without a prescription.

Diagnosis of a threadworm infection can normally be made with a combination of the symptoms detailed above and the presence of threadworms in the stools. Usually a diagnosis from a doctor is not necessary unless it is a child under 2 years old or is a woman who is pregnant or breastfeeding.

If you would like any help diagnosing threadworms please Contact Us.  



Treatment for threadworm will need to include everyone in your household. This is because the risk of the infection spreading is very high. This will also need to include people who aren’t currently presenting with any symptoms. The majority of cases of threadworm treatment will involve a single dose of Mebendazole, which is the drug in the branded medicine, Ovex. Mebendazole is 90-100% effective at killing the threadworms and normally does this within a couple of days, after which your symptoms should subside.

Ovex does not kill the eggs, which is why strict hygiene measures (outlined below) should be followed for six weeks after treatment. This will ensure the threadworm’s eggs aren’t spread and cause reinfection. A follow-up dose can be taken after two weeks if required.

The threadworm treatment, Ovex, is available as a chewable tablet or banana-flavoured suspension that is suitable for children aged 2 years and over. Children under 2 years that are suffering with threadworm require attention from their GP. Ovex threadworm treatment is also not suitable for those who are pregnant or breastfeeding.

Threadworm treatment should always include preventative and hygiene measures for at least 6 weeks as detailed in ‘Prevention’ below.


It’s not always possible to prevent threadworm infection but by following common sense hygiene practice the risk of infection can be significantly reduced, such as:

  • Washing hands regularly, particularly after going to the toilet and before eating food.
  • Keeping fingernails short and clean, particularly underneath, as the fingernails can harbour and spread eggs from person to person.
  • Washing night clothes, bed linen, towels and soft toys.
  • Avoid shaking any material that may be contaminated with eggs, such as quilts and clothing. This can make the threadworm eggs airborne, allowing them to be breathed in resulting in infection.
  • Keeping surfaces clean, particularly kitchens and bathrooms and regular vacuuming of floors will all help prevent infection. Threadworm eggs can survive for up to three weeks on surfaces making thorough cleaning vital.
  • If already infected then not scratching the affected area will help to prevent reinfection and also reduce the risk of spreading the infection to other people.    


Threadworm FAQs


Can I catch threadworms from my pets?

No, threadworms only infect humans and are not spread in animal faeces. Their eggs however, can stick to animal fur if touched by someone who is infected. This can then be spread to be other peoples hands from touching or stroking the pet.

Can adults catch threadworm?

Yes, although it is more common in children, people of any age can catch threadworms.

What do I do if the infected person is under 2 years old or is pregnant or breastfeeding?

If you suspect threadworms and you are pregnant or breastfeeding, or if you think your child, who is under two years of age, has Threadworms then it is necessary to consult a GP prior to treatment.  The treatment in these cases can differ from what is recommended for other people.

Do I need to keep my child off school if they have threadworms?

No, there is no need to keep children off school if they have a threadworm infection. It is likely that other children in the school already have threadworm so the best approach is to inform the teachers and ensure the school is enforcing a good hygiene approach with all children.

What if I don’t treat a threadworm infection?

Not treating threadworms is unlikely to lead to any serious consequences, although there are more severe symptoms as detailed above. The symptoms of threadworms such as anal itching, and the subsequent sleep disturbance, can often be difficult to live with and will persist if the infection is not treated.

Should I take treatment if my family are infected, even if I don’t have symptoms?

Yes, as threadworms are very easily spread the whole family should be treated. At once to help prevent the risk of re-infection.

Should I be worried if my child has threadworms?

No, threadworms are very common in children and are easily treatable. 


Threadworms Pictures


The Independent Pharmacy is an online pharmacy and online doctor service is owned and operated by ABSM Healthcare Ltd (Company Reg. 08515600) and Red Label Medical Ltd (Company Reg. 08676338). All information that appears on this website is intended for information purposes only and should be used to supplement, not replace, your relationship with your local healthcare professionals. You should consult your doctor if you think you may have a health problem or before you start taking a new medicine. Please ensure you always read the information leaflets supplied with any medicinal products.For more information see our policies and terms and conditions at the bottom of every page. © 2014 ABSM Healthcare Ltd. All rights reserved.
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