Pinworms are small, thin, pin-shaped worms that sometimes live in the human colon and rectum. They're also called threadworms. They're about 1/4- to 1/2-inch long — about the size of a staple.

Symptoms of parasites in humans. It may be hard to believe, but you don’t always know when you have an uninvited guest inside you. You may not have any symptoms, or they may be quite mild.

There are parasites all over the world that can infect humans. Some of them are easy to avoid, but others are more common than you might think.

Pinworm symptoms. You might have anal itching, especially at night. You could also have stomach pain, nausea, or vaginal itching.Sometimes, pinworms can be seen around your anus or on your ...

Parasites live in other host organisms and depend on them for survival. Parasites that can affect humans include ticks, lice, and hookworms. Symptoms of a parasite infection in humans can vary ...

If you have intestinal parasites, you may have digestive symptoms, including abdominal pain and diarrhea. Untreated worms may cause complications. Intestinal parasites, including intestinal worms ...

But intestinal parasites affect humans and are not just a Third World concern: They affect millions of Americans. Indeed, according to the CDC, more than 60 million people in the US are infected ...