Another symptom is a pain which you do not even expect. If you have unstable angina, the pain will be addressed as a surprise. When a patient experiences a stable form of angina, he or she can at least forecast when the next attack will happen. In the case of an unstable form, the pain seems more painful as it comes unexpectedly. Sometimes, such things as going into the cold water or walking up the hill may be the reason for the discomfort.