Respiratory failure is a serious condition that significantly and negatively affects quality of life. The initial and primary symptoms of this condition include shortness of breath (dyspnea) and the feeling of not being able to breathe. Patients may experience difficult breathing and shortness of breath even at rest. Even the slightest physical activity can lead to an increased heart rate. Other common symptoms of respiratory failure include coughing, wheezing, insomnia, excessive sweating, headache, confusion, and mood disorders (irritability, anxiety). If bluish discoloration (cyanosis) is observed on the lips and fingertips, it is vitally important to consult a pulmonary specialist immediately.

In chronic respiratory failure, respiratory functions deteriorate permanently and progressively. Patients with chronic respiratory failure may develop some tolerance over time as they continuously experience these symptoms. Breathing is generally faster in these patients, and their skin may appear bluish due to low oxygen levels. The patient's adaptation to this condition to some extent creates a risk of symptoms being overlooked, which can lead to serious, even life-threatening dangers.