Can hook worms enter organs?

Yes. The larvae (immature form of the worm) get into the skin. The larvae move to the lungs via the bloodstream and enter the airways. The worms are about 1/2 inch long. After traveling up the windpipe, the larva are swallowed. After the larvae are swallowed, they infect the small intestine. They develop into adult worms, live there for 1 or more years. Adult worms and larvae r released in the feces.