What causes sharp nagging pain on left side under breastbone?
Patient: I am 45. I am experiencing a sharp nagging pain on my left side. Been going on for about an hour. Seems to be effected by movement..gets better if I change posistion. But then returns. The pain is located under my breastbone. Can you tell me what this might be? Thanks Doctor: Hello,  This should be related to the intercostal muscle spasm. Doing hot water fomentation, using loose clothing and simple deep breathing exercises should provide relief.  Hope I have answered your query. Let me know if I can assist you further.  Regards, Jay Indravadan Patel, Physical Therapist or Physiotherapist