Aspiration pneumonia is mainly a respiratory symptom. Symptoms can be divided into chemical aspiration pneumonia, obstructive aspiration pneumonia and bacterial aspiration pneumonia according to different classifications. 1. Chemical Aspiration Pneumonia: The main manifestation is sudden dyspnea, diffuse rales may appear, and acute respiratory distress syndrome may occur in severe cases. 2. Obstructive aspiration pneumonia: the symptoms are spasmodic cough caused by the obstruction, which can be accompanied by shortness of breath. If it is caused by a tracheal fistula, the symptoms may occur after eating. 3. Bacterial aspiration pneumonia: in the presence of confusion, there are no obvious symptoms, but then there is shortness of breath, which may be accompanied by rales, and in severe cases, cyanosis and hypotension may occur. Most of the onset of aspiration pneumonia is related to eating or drinking and inhalation of irritating gases. You should maintain good living habits, maintain oral hygiene, and prevent choking when eating, etc. If you suspect aspiration pneumonia, you must seek medical attention and treatment in a timely manner.