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Hi welcome to Chat Doctor....Here is the area of pain you are locating is suggestive of gall stone or mild cholecystitis like condition . For that investigate with USG ....USG will also rule out if gastritis or any other inflammatory condition there leading referred chest burning ... Take omeprazole capsule on empty stomach before meal for two weeks.... Avoid heavy fatty meal ... Avoid excess spicy foods ... Depending on physical examination further investigation done and causative treatment done. If no any cause found pain can be from muscular strain as you are suspecting ... Take care.