I want to know what is the difference between a cardivascular problem and a heart disease?

Heart disease: Heart disease is a specific malady of the heart. Cardiovascular problem is something happening which creates a problem with the cardiovascular system, it may not be a disease. For instance hypothermia may be a cardiovascular problem but isn't a disease per se.

1 is subset of other: Thanks for your good question. Think of it this way: your cardiovascular system includes your heart (cardio) and all of your blood vessels (vascular). So, heart disease refers to problems affecting the heart, whereas cardiovascular problems includes heart diseases, as well as any problem affecting blood vessels (which are basically all over our body).