If you feel faint, dizzy, or weak, or have trouble doing routine activity, inability to speak short sentences due to breathlessness, or wheezing then visit a doctor right away.

A pulmonologist is a doctor who specializes in the diagnosis and treatment of respiratory conditions.

You should see a doctor if you experience unexplained breathlessness or a cough that lasts more than a few weeks. While breathlessness is a common symptom you also need to look out for fatigue, coughing up blood, weight loss, persistent cough, mucus production, chest infection, etc.