About 20% of heart attack victims have a period of relative calm before the attack that often goes unnoticed, and many survivors report afterwards that they felt something different in their bodies in the hours, days, or even weeks before the heart attack. Sign #1: Severe fatigue after a brisk walk, so fatigued that you don’t even have the strength to straighten up. Fatigue is not limited to a certain part of the body, but the whole body. If you feel unprecedented fatigue, you need to be alert to a heart attack! Signs 2: Some heart attack patients will experience shortness of breath and breathlessness in addition to the common symptoms, and this difficulty in breathing is often referred to as not having enough breath. This wheezing is often overlooked, especially in older people with lung disease. Sign #3: Forearm and shoulder pain. Although the left arm and shoulder are most commonly affected, it can also radiate to the right arm in severe cases, although it is extremely rare to see pain on the right arm only. This must be distinguished from cervical spondylosis. Signs 4: Some people have had stomach problems, so it is easy to confuse stomach problems with stomach discomfort caused by heart disease, which rarely causes colic and severe pain, and pressure pain is not often present, but only a feeling of suffocation and fullness! Signs 5: A few patients with angina pectoris have an attack that manifests as a toothache. When toothache occurs suddenly, especially with chest tightness. When discomfort or profuse sweating, you should consider whether angina attack and deal with it promptly.