6Fatigue
Since the immune system has to work harder to fight against the virus causing croup, people with this condition tend to feel exhausted and tired all day long. Also, the combination of many symptoms at the same time can affect your normal schedule and make you run out of energy. This symptom can occur suddenly and abruptly. You might feel well in a few hours during the day before the fatigue keeps occurring at night. It is especially more common in people with a compromised immune system, such as children, the elderly, or those with HIV/AIDS. [6]
