A characteristic of SARS-Covid-19 is dyspnea. Shortness of breath is seen as a sign of worsening, and in more severe cases, individuals have tachypnea and tachycardia and need to be intubated and ventilated.

Various disorders can cause hypoxia (low oxygen concentration)

- Anemias, respiratory failure

- pulmonary embolism or pneumothorax

- pneumonia.

- cardiopulmonary disease (indicate an exacerbation of the disease.)