Is hitting the chest/heart area considered not effective in boxing

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Why does my chest hurt after boxing? - Quora

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Is there any cure for the pain after being punched in the chest while fighting? - Quora

How can a strong punch in the chest affect the heart? - Quora

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Is a punch to the chest to cause unbalance legal in boxing? - Quora

How long after I get lip fillers should I start boxing again? - Quora

Is it possible to return to boxing after a boxer's fracture? - Quora