My mother 68 years old have heart patient. She had done angiography in2016 then Dr. Told ua that she had minor blockage only 20%. And prescribe medicine. Now after 5 years ia there any chance of increasing that blockage? My mom don't have diabetes, or high pressure. But sometimes she have mild chest pain and goes after few hours. Her heart rate was remain under 60 like 55-56 bph. Every time ask about this pain to Dr. they told me that its not related to heart. It may be muscle pain or something else. But I worried is it something serious? Her echo and cholesterol level was normal. I want to know that how long heart related pain last? Because from past few days my mom have mild chest pain an it last for more than 7-8 hours. Maximum tym in the middle of chest. Pls suggest what should I do.