Some common chicken diseases include Fowl Pox and Newcastle Disease. The Avian Flu is another disease common with chickens and other birds, states the University of Florida IFAS Extensions.
Fowl Pox is a disease that affects the respiratory system. The disease spreads easily and is characterized by wart like sores on the chicken's body and inside its mouth, states the University of Florida IFAS Extension.
Newcastle Disease is also a respiratory disease. This condition is highly lethal and can affect humans. The most common signs are a raspy chirp and labored breathing.
The Avian Flu is a highly spreadable disease that affects all birds. Loss of appetite and diarrhea are the hallmark signs of the condition.