Parasites in the intestine can cause a multitude of symptoms, such as abdominal discomfort, cramps, nausea, loose stools, fatigue, and weight loss. To confirm the presence of parasites, a stool sample needs to be taken and tested in a laboratory. Stool tests can detect the presence of parasites, eggs, or larvae. If a person does not have access to laboratory testing, they may be able to detect parasite activity in their stools by inspection. To do so, they should look for the presence of worms, larvae, and/or eggs in their stool sample. Additionally, they should look for any changes in the color, consistency, or odor of their stools. If any of these signs are present, it may indicate the presence of parasites and further testing should be done to confirm.