Parasitic worm infections (helminthiasis) can cause a wide range of symptoms depending on the worm type and infection severity. Common symptoms include abdominal pain, diarrhea, nausea, vomiting, bloating, and unexplained weight loss. Some individuals experience anemia, fatigue, weakness, or vitamin and mineral deficiencies due to nutrient malabsorption. Skin rashes, itching around the anus, coughing, or shortness of breath may occur when larvae migrate through tissues or lungs. In children, infections can impair growth and cognitive development. Effective treatment relies on appropriate antiparasitic drugs, often sourced through a reliable nitazoxanide supplier under medical guidance.