Hello, i have had severe pain under my left breast for the last 3 weeks. worsens when i cough, inhale deeply, and sneeze. that is my only symptom. i do not have a consistent cough or fever, or no shortness of breath. im wondering if this is pleurisy?

Some options: You could be correct but there can be other causes such as a nerve irritation or compression, a muscle spasm or contraction, a rib costochondral inflammation. If you feel well otherwise, look at your posture and how you move or lift, try an anti-inflammatory medication (like Advil or Motrin), use moist heat in the area, if not better or other symptoms, check with your doctor. Get better !!