Hi Latina19401,
Unfortunately, there is no way to tell for sure without an actual exam. Pain under the left breast could be a heart problem, a lung problem, muscle pain, rib pain, or even gas or reflux. Since it could be serious, I encourage you to go to the emergency room or see your physician as soon as possible for a diagnosis and treatment.
Best of luck,
Monica M. Skidmore, MS, RD
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