Good Morning! Thank you for your order. You very well might be disturbing hookworm larvae. DO NOT take more than what is directed and don't take it with your HUMAWORM. If the heaviness turns to pain or becomes very uncomfortable - STOP taking it. HUMAWORM has purifying herbs included that will ease your body and help it restore itself during the cleanse. (Elecampane is great for purifying the lungs.)
Here is how hookworms infect the human body and how the larvae infect the lungs: (copied from the website)
HOOKWORMS – are also called “Necator Americanus” which means the American Murderer. They come from contaminated food and water. The eggs hatch in the intestines then migrate to the lungs through the bloodstream where they are coughed up and swallowed. They then travel back to the small intestine to reproduce. In the lungs they can cause pneumonia . In the intestines they hook themselves into the intestinal walls where each one drinks up to 1cc of blood per day causing bleeding and tissue death, not to mention anemia weakness. Hookworms from dogs and cats penetrate human skin and stay there causing skin problems and rashes including edema. (We get these from pets licking us or us petting or grooming them.) Hookworms also cause asthma, eye pain, insomnia, and dry skin and hair.