Not necessarily. Cardiac caths are used to identify blockages in the arteries that supply blood to the heart. The idea, which makes intuitive sense, is that if a significant blockage is present, it can be opened with a balloon or a stent, presumably decreasing the chances of a heart attack in the future. This has not been shown to be true. The available evidence doesn't show cath treatment superior to meds alone.
Stress imaging. If you have plain treadmill, if it is equivocal, go with stress test with imaging or cardiac ct, before going with cardiac cath.