The most acute type: commonly known as "lockjaw wind", body temperature of 41 ℃ or more, swelling of the throat, severe can spread to the root of the ear and neck. The sick pig is highly difficult to breathe, open mouth breathing. Visible mucous membrane cyanosis, foam out of the mouth and nose, often in a dog sitting position. The lower part of the carapace appears red, once the respiratory symptoms, the condition deteriorates rapidly, and soon die, mortality rate of 100%, some sick pigs are septicemia symptoms, can not see the symptoms, sudden death.

Acute type: mainly presenting fibrinous pleuropneumonia symptoms. Body temperature is high, there is dry and short spasmodic cough, dyspnea, nasal purulent secretion. There is severe pain in the chest on palpation. There are erythematous or hemorrhagic spots on the skin. Usually die of asphyxiation in 4 to 6 days, and turn chronic if not dead.

Chronic type: chronic pneumonia or chronic gastroenteritis symptoms. Sick pigs persistent coughing, dyspnea, loss of appetite, often diarrhea, high and low body temperature, progressive emaciation, some appear to be swollen joints, skin scab-like eczema, most of the death due to exhaustion, the death rate of 60% to 90%.

Some swine pneumonic disease and swine fever occur in mixed infections. It is difficult to confirm the diagnosis of the disease by clinical symptoms alone, and it is necessary to take heart blood, various exudates and various parenchymal organs to be sent to the veterinary laboratory for examination.