The pain of angina pectoris generally occurs in the process of inducing factors, not afterwards. The common inducing factors of angina pectoris are overwork, emotional excitement (anxiety and anger), cold stimulation, excessive tension, overeating and so on.

(2) Pain site

The pain is mostly located behind the sternum, the size of the palm is not clear, and the position is relatively fixed at each attack. There may also be pain in other parts, such as epigastric discomfort, compression or blockage of trachea or throat. Upper limbs, shoulders, back and left arm, etc.

(3) the nature of pain

Most of them are oppression, tightness, tightness, blockage or burning sensation, and the pain is generally not severe. It's only a local heavy feeling, but it's very uncomfortable. In severe cases, pale face, cold sweat and dying feeling may appear. During the attack, patients are often forced to stop their original activities and press their chest with their hands until the symptoms are relieved.

(4) Duration of pain

The pain often increases gradually, lasts for 3 ~ 5 minutes and gradually disappears, rarely exceeding 15 minutes. Pain can occur many times a day, usually every few days or weeks.

(5) Mitigation methods

Angina pectoris attacks under some inducement, and gets better quickly after resting quietly or removing the relevant inducement. The sublingual administration of nitroglycerin has obvious effect, and it usually relieves within 1 ~ 2 minutes.