Cyanosis is a symptom rather than a disease itself, so management should be focused on treating the underlying cause. If it is an emergency, management should always begin with securing the airway, breathing, and circulation. In patients with significant respiratory distress, supplemental oxygen (in the form of nasal canula or continuous positive airway pressure depending on severity) should be given immediately. If the methemoglobin levels are positive for methemoglobinemia, first-line treatment is to administer methylene blue.
symptom of Hypoxia 
symptom of Mouth breathing
symptom of Bronchitis
symptom of Pneumonia
symptom of Air embolism
symptom of Acute bronchitis
symptom of Aspiration pneumonia
symptom of Heart failure