The occurrence of myocardial infarction in women is often atypical, with common precursors manifesting as sudden onset chest pain, or discomfort in the precordial region, or pain in other areas associated with exertion. Myocardial infarction is caused by the formation of blood clots on the basis of coronary artery stenosis. Stressful situations can lead to plaque instability within the coronary arteries or even rupture and the formation of blood clots, thus causing myocardial infarction. The precursor symptoms of myocardial infarction are as follows: Chest pain at night or at rest: when there is dull pain or crushing-like pain or burning pain in the precordial area without any reason at rest or at night when sleeping, or a sore and swollen feeling in the jaw, or with sore and swollen pain in the left upper limb, be highly alert to a heart attack. Continuous nocturnal attacks need to be seen in the cardiology department of the hospital as soon as possible. Aggravation of angina symptoms: Patients with pre-existing angina present with aggravation of angina symptoms, manifested as chest pain with light physical activity, increased frequency of chest pain, and prolonged duration of chest pain, medically known as exertional worsening angina, should be on high alert for an attack of heart attack. New onset of angina symptoms: people who have never had chest pain symptoms and have recently experienced activity-related dullness or pressure-like pain or burning pain in the precordial region, or jaw soreness and swelling, or with soreness and swelling of the left upper limb, and still experience chest pain episodes when the intensity of activity gradually decreases, especially people who have the habit of morning exercise and experience the above-mentioned chest pain symptoms during morning exercise, should be on high alert for a heart attack. Pain in other parts related to angina: If there is pain in other parts related to activities, such as epigastric pain, toothache, jaw pain, left upper limb pain, shoulder and back pain, all need to be alert. In summary, if the degree, duration, and triggering factors of chest pain are different from previous episodes, you should be highly alert to the occurrence of heart attack. Atypical chest pain: The proportion of atypical chest pain is higher in women compared with men. The sudden appearance of chest pain without obvious triggers, along with profuse sweating, vomiting and nausea, requires immediate medical attention. Sudden onset of never before experienced chest tightness and weakness and panic, or panic and shortness of breath during activity with aggravation, also requires immediate medical attention.