Sometimes i shortness of breath but usually it's rare and only happens for a day or so.iv had it nonstop for a few weeks now and can't get ride of it?

See a doctor: Shortness of breath can occur for many reasons, including congestive heart failure (fluid in lungs), pneumonia (infection), asthma, inflammatory processes, foreign body (aspiration), blood clots (pulmonary embolism), and airway tumors. There is no way to answer in this limited space. A thorough physical exam, and likely a chest xray, possibly ecg, ct, pulmonary function tests need to be done.

Needs evaluation.: Shortness of breath lasting for a few weeks merits a visit to your phyisician for a thorough examination.

Shortness of breath: you should be seen by a physician to have this evaluated if you have persistent new shortness of breath.