Help please? what is the difference of muscular pain and a heart attack ?

Nature and severity: There is no hard and fast rule, and diagnosing a heart attack requires training, experience, investigation and judgement, but some generalisations follow... Heart attack pain is often deep, visceral, unrelenting and with symptoms of nausea, sweating and pressure. Chest wall pain is often more sharp, stabbing, fleeting, and can change with position, using the affected muscle and with breathing.