This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
Right sided pain can be due to the esophageal inflammation of esophagitis commonly.
Muscle sprain related pain is another common cause.
These two causes account for most of the cases.
However some times this can be more serious in nature.
Expanding thoracic aortic aneurysm can press on the adjoining structures causing the symptoms.
mediastinal mass like swollen lymph nodes or tumor also can cause this.
Underlying heart problem also a possibility.
Hnce, further evaluation is recommended with EKG, chest xrays initially and then CT scan with contrast if needed.
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