What happens if you have a bad cough and you feel very weak?

If you have a bad cough and feel very weak, it could indicate an underlying illness such as a respiratory infection, bronchitis, or even pneumonia. Weakness may also suggest that your body is fighting off an infection, leading to fatigue. It's important to stay hydrated and rest, but if symptoms persist or worsen, seek medical attention to rule out serious conditions and receive appropriate treatment.