Parasitic worm infections can cause a wide range of symptoms depending on the species and severity. Common signs include abdominal pain, diarrhea, nausea, vomiting, bloating, and unexplained weight loss. Some people experience fatigue, anemia, vitamin deficiencies, or itchy skin rashes. Intestinal worms may cause visible worms in stool, while tissue parasites can lead to cough, muscle pain, or swelling. In children, growth delays and poor concentration are possible. Severe infections may trigger bowel obstruction or organ damage. Accurate diagnosis is essential, and antiparasitic therapies, including products discussed in nitazoxanide wholesale markets, are commonly used under medical supervision.