Heavy Breathing
In mild cases, croup does not affect the respiratory system much. But when the condition progresses, the airways would be blocked due to swelling and inflammation. This leads to heavier breathing and difficulty breathing. You might need to breathe more quickly and harder to compensate for the loss of oxygen. It is important to visit a medical facility as soon as possible as these problems can affect other organs in the body. In more severe situations, people with croup might need to breathe in oxygen from a ventilator or machine. [4]
