4. Frequent and recurring nausea and vomiting.
Pinworms lay the majority of their eggs within the skin that surrounds the anus, but for the rest of the time they spend their days moving around the digestive system – and this can cause a huge amount of discomfort within the body that accompanies the rash and itching, and this can last as long as the infection itself.
Frequent and recurring vomiting and nausea that can be combined with the other symptoms on this list makes for a sure sign of pinworm infection, and it means that you should make an appointment with your doctor as soon as you can so that the treatment can be started and the risk of further infection can be brought to a minimum.
Nausea and vomiting are likely to last as long as the infection itself, although it can be controlled as a separate symptom to make it easier while the body heals.