question: Hi,  My mum started getting chest pain that radiates to her back about a month ago. Since a few days ago, these episodes have increased in frequency and at the same time she felt very lethagic, weak and she became pale. We took her to the ER at the hospital immediately and all the blood tests, cardiographs and x-rays came back normal. She is about to have a stress test (on the treadmill). What can this possibly reveal if all the other tests were normal? Does it sound like she has a heart problem?