Parasitic worm infections are caused by exposure to helminths such as roundworms, tapeworms, and flukes. Common causes include consuming contaminated food or water, poor sanitation, inadequate hand hygiene, and contact with infected soil. Undercooked meat and unwashed fruits or vegetables can also transmit worm larvae. In some regions, walking barefoot allows parasites to enter through the skin. Weakened immune systems and overcrowded living conditions increase risk. These infections are more prevalent in tropical and developing areas, where access to clean water, healthcare, and effective treatments sometimes sourced through channels like nizonide wholesale is limited.