Diseases can be congenital or acquired. Their causes are also physical, chemical, biological factors that are important to treat. Depending on this, infectious, invasive (parasitic) and non-infectious diseases are distinguished. When making a diagnosis, body temperature, pulse rate and respiration of domestic animals are necessarily taken into account. Then there is a comparison of them with average indicators. And when the hens begin to sneeze and wheeze, this should alert the poultry farmer.