Parasitic worm infections (helminthiasis) can cause a range of symptoms depending on the type of worm. Common signs include abdominal pain, diarrhea, nausea, vomiting, fatigue, and unexplained weight loss. Some people experience itching around the anus (especially with pinworms), while others may develop anemia or nutrient deficiencies. In severe cases, cough, fever, or visible worms in stool may occur. Poor hygiene and contaminated food or water often contribute to infection. Treatment typically involves antiparasitic medications such as nizonide 500mg, which helps eliminate worms and restore digestive health effectively when taken as prescribed.