How can I tell if my chicken has worms?

Most worms live within the chicken’s intestinal tract and therefore can be seen in your chicken’s poop, so check it regularly to ensure it is healthy and parasite free, however, there is also a parasite called Gape Worm, this lives in your chicken’s respiratory system so you would not be able to check the poop for this, but you might notice some symptoms such as sneezing, runny eyes and nose and most commonly a kind of gasping or lifting of the head and gaping of the beak.