Parasites could provide some answers to the annoying nature of allergies. One of the worst things to do late at night is to google infections by parasitic worms. You can ruin your life even more if you click on image search. Of all the possible pathogens and parasites that can victimize humans, worms are by far the most upsetting ones. Nothing quite compares to a faceless, slimy, stringy thing that drills itself through your insides, pooping, laying eggs, spending its whole life inside you. It’s right out of a horror movie.