The symptoms of coronary heart disease primarily include typical symptoms such as pain in the precordial area triggered by physical activity or emotional excitement. The pain is often spasmodic or compressive, or it may feel like suffocation. The pain begins behind the sternum or in the precordial area and can radiate upwards to the left shoulder and arm, even reaching the little finger and ring finger. Rest or taking nitroglycerin can alleviate the pain. The radiation of the chest pain may also involve the neck, lower jaw, teeth, and abdomen. Chest pain can also occur during rest or at night, caused by coronary spasm, also known as variant angina. If the nature of the chest pain changes, such as newly occurring progressive chest pain, wherein the pain threshold gradually declines to the point that slight physical activity or emotional excitement, or even rest or deep sleep can trigger it. The pain gradually intensifies, becomes more frequent, and lasts longer. If removing the trigger or taking nitroglycerin does not relieve it, unstable angina is often suspected. Symptoms of coronary heart disease with angina can also be accompanied by systemic symptoms such as fever, sweating, panic, nausea, and vomiting.