Those who wonder about how we get parasites into our system - parasites can be ingested by eating unwashed vegetables that have eggs on them or by eating undercooked meat. Soil also contains larvae that can be absorbed through the skin so people who walk around barefooted can pick up larvae this way; or kids who play in dirt can pick them up under fingernails or through bare skin.
Food triggers can lead to constipation, migraines, and also swelling.