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Any pain in chest and especially on the left side need high index of suspicion (whatsoever benign it seems) and cardiac / heart causes needs to be excluded by thorough physical evaluation and EKG. So you need to consult a physician and get an EKG. There are some other common causes of chest pain in your age group like costochondritis, but they are considered if the heart is ruled out. Read about the chest pain and costochondritis in these resources;
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You can take Ibuprofen. No, there won't be any problem. Pain, going to arm, shoulder, upper abdomen, perspiration, restlessness, breathing difficulty are the signs which tell you about the cardiac involvement.