Hi and welcome to the forum! I am glad that I can help you.
You would like to know the cause of twitching in your sternum.
Twitching is a brief rapid contraction of a muscle. However, twitching may sometimes be described as a sharp or sudden feeling of physical pain. Twitching may appear due to increased excitation of the nervous system (caffeine intake, neurological or muscular diseases).
Given the symptoms that you described, you are experience twitching in your sternum. If twitching doesn't occur often, especially if it appears after exerting and caffeine intake, it could be considered as normal. You may see a neurologist to rule out neurological or muscular disease. You may want to consider seeing a cardiologist to rule out any underlying heart disease.
Please keep in mind that I provide medical information only. I am not able to diagnose medical conditions online. Please contact your doctor or other qualified healthcare provider such as a neurologist or a cardiologist for further advice and information about diagnosis and treatment options.
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