Itching around the anus, especially at night
Seeing worms or worm segments in stool, underwear, or around the anus
Abdominal pain or cramps
Nausea or vomiting
Diarrhea or loose stools
Unexplained weight loss
Bloating or gas
Fatigue or weakness
Loss of appetite
Itchy rash or skin irritation
Coughing or wheezing in some infections
Blood in stool in some cases
Grinding teeth or disturbed sleep in children
A healthcare provider can confirm with a stool test or other exam