17 Reasons For Prolonged Cough

7. Still Recovering from Another Sickness

While coughs are usually caused by viruses, sometimes they come as a symptom of a different illness. If you are taking a while to recover from a sickness, it may cause your cough to linger as well. Even if you feel like you are on the road to recovery, some of its unseen side effects that haven’t completely healed could still be making you cough. An example of this is swelling in your throat or lungs.