Parasites, though often overlooked, can be a common underlying cause of chronic illness in the United States. These microscopic organisms can invade the human body and disrupt its normal functions, leading to a range of health problems that may persist for months or even years if left untreated. Parasites can enter the body through various sources, such as contaminated food and water, exposure to infected individuals or animals, or insect bites. Once inside the body, they can reside in different