Stable angina is mainly referred to exertional angina, other than exertional angina other types of angina, are called unstable angina. So, there is only one type of stable angina, which is exertional angina. When such a patient has an attack, each time it lasts about 3-5 minutes, generally speaking, it does not exceed half an hour. When the condition strikes, if the patient can sit down to rest or take nitroglycerin or heart pills under the tongue, the uncomfortable symptoms can be relieved more obviously. The pain is mainly located behind the body of the sternum, but can also spread to the precordial region, and some people can even radiate to the left shoulder, the inner side of the left arm, up to the ring finger. There are also patients with relatively less typical symptoms, which may also manifest as toothache, or ear pain when stable angina occurs again.