When chest pain becomes a worry

MR A and Mr B both had chest pain but had different outcomes. When does one need to worry about the chest pain that one has been feeling over the last few days? The characteristics of typical angina (chest pain due to significant heart artery disease) are:

Atypical angina is defined as having two out of the three characteristics described above. Non-anginal chest pain is defined as having one or none of the characteristics of typical angina.

Likelihood of heart disease