Patients may show no signs before sudden death, or they may show signs such as chest tightness, chest pain, shortness of breath, palpitations, weakness, and dizziness. Sudden death is the sudden and unexpected occurrence of a violent death in a person who appears healthy on the outside. Sudden death can be preceded by no clinical signs and symptoms, and cardiovascular system, respiratory system, and central nervous system diseases can lead to the occurrence of sudden death. Contemporary people’s unhealthy lifestyle, such as long-term late night, exhausting work and mental stress are easy to induce a variety of systemic diseases that can lead to sudden death, when the body appears chest tightness, breathlessness, chest pain, shortness of breath, palpitations, fatigue, dizziness, blackout, or even fainting need to be highly alert, these may be the body’s signals sent out before sudden death. If the above signs and symptoms occur, it is recommended to go to the hospital in time to avoid serious consequences.