What may cause chest pain that radiate down to the upper arm?

Chest pain to arm. Can be a typical heart attack that irradiates to the jaw and then left arm mainly (not right arm) then can at times extend till the left wrist area to the fingers = that trajectory is the trajectory of the meridian of energy of the heart in oriental medicine. But it can be from other elements in the chest as well. Medicine is not easy and symptoms mainly rarely typical leading to error in DX + rx.

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What would cause sharp right chest pain goes in neck and only right side face up to my ear and pain down my arm?

Many possibilities. A number of conditions can cause right chest pains. Angina, or heart pain from reduced blood flow to the heart, is not usually sharp nor is it typically on the right side of the chest nor does it typically go up into the face or right arm. Although it does not sound too likely your symptoms are from the heart, you should see your doctor to figure out what is the cause. Read more...
Musculoskeletal . At your age it is an outside possibility that it is heart related but really really sounds more musculoskeletal. Read more...

Chest pain down left arm through back for over a week, likely caused from gastritis should I go to ER or just keep taking pepcid (famotidine)? Hematocrit was 37

Depends. If your symptoms are bearable and you're confident of the diagnosis, the er won't be of much value. You'd be better off calling the one who prescribed Pepcid (famotidine) and ask for a more potent schedule, strength, or medication. If you're in distress and need immediate relief or reduction of discomfort, then that's why we have ers. Read more...