Middle back pain: Back pain in the middle back area. See detailed information below for a list of 31 causes of Middle back pain, Symptom Checker, Assessment Questionnaire, including diseases and drug side effect causes. Â» Review Causes of Middle back pain: Causes | Symptom Checker Â» | Assessment Questionnaire Â» Causes of Middle back pain:
Other medical conditions are less frequent causes of left atrial enlargement. For example, a ventricular septal defect -- a hole in the wall that separates the right and left ventricles -- can alter blood flow through the heart such that there is overfilling and enlargement of the left atrium.
If you have atrial fibrillation, blood clots can form in your heartâs left atrium. Cardioversion may knock loose a blood clot in your left atrium. If the clot (embolus) travels to your brain, it can cause a stroke.