If you have been suffering a cold or upper respiratory infection and your breathing becomes shallow or labored, you may have pneumonia. This is a serious symptom that may require a nebulizer breathing treatment in order to open the lungs. Consult your physician immediately to avoid further issues from oxygen deprivation such as lightheadedness, blood flow issues, or losing consciousness. Watch out for these other 12 signs your “common cold” could be something way worse.
Source : https://www.rd.com/health/conditions/pneumonia-symptoms/269