Lung failure is respiratory failure, the common manifestations are chest tightness, dyspnea and cyanosis, severe cases may be accompanied by abdominal distension, loss of appetite, increased heart rate, drowsiness, coma and other manifestations, which can be life-threatening. 1. Chest tightness and dyspnea: lung failure can lead to severe hypoxia, thus causing chest tightness and dyspnea and other related symptoms; generally speaking, the above symptoms may be reduced when resting, and usually aggravated after activities. 2. Cyanosis: due to severe hypoxia, patients with respiratory failure may have cyanosis in the lips, face, nail bed and other parts of the body. 3. Abdominal distension, loss of appetite, etc.: lung failure may cause gastrointestinal hypoxia, which leads to edema of the gastrointestinal tract, causing abdominal distension, loss of appetite and other related manifestations. 4. Increased heart rate: the lack of oxygen in lung failure may lead to reflex increased heart rate, resulting in panic and other manifestations. 5. Drowsiness, coma and other symptoms: lung failure, hypoxia is prominent or accompanied by carbon dioxide retention, can cause drowsiness, coma phenomenon, severe lung failure may also lead to respiratory cardiac arrest, endangering the life. To summarize, respiratory failure needs to go to the respiratory internal medicine department in time, and active treatment.