Hello, can you describe the nature of pain? For example, paroxysmal, crushing pain, pain occurs with other symptoms? Where is the pain? Is there pain in the posterior sternum, anterior heart area and left upper limb? Do you remember when it happened during rest, work or emotional excitement? How long does each attack last? How many minutes? How many days? How many times a day? Does it disappear after rest or use of nitrates? Generally speaking, male, over 40 years old, fatigue, emotional excitement, anxiety, cold, rainy weather, acute circulatory failure are common causes of angina pectoris.