Someone goes through a long flight, the plane lands, and is about to see a loved one, but gets off the plane without taking a few steps, falls headfirst, and leaves the world. A young mother wakes up the day after giving birth to go to the bathroom, falls and never sees her son again…. Elderly man with a fracture in bed for many days, receives a call for surgery from the hospital, and just after being moved to a hospital bed, the elderly man has trouble breathing and dies in the blink of an eye. The demon that caused this sudden death was “pulmonary embolism”. Blood clots can form after prolonged sedentary, bedridden, postpartum, fracture, or surgery due to slow blood flow (see figure). When the blood clot returns to the heart with the blood flow and then to the pulmonary artery, as the branches become thinner and thinner, the clot becomes larger and larger, eventually blocking the pulmonary artery. This leads to the interruption of blood circulation in the body and sudden death occurs.