What's the difference between roundworms and pinworms?

Ascaris is a common intestinal parasite, which can cause abdominal pain, grinding teeth at night and other symptoms. In severe cases, anorexia and indigestion can also occur. Pinworms are small in size and can cause itching around the anus. They usually crawl out from the anus at night. It is recommended to use anti-insect drugs for treatment and wash hands before eating.