Decease refers to the end of life, marking the cessation of all biological functions that sustain a living organism. It is a natural part of the life cycle and can occur due to various factors, including illness, injury, or old age. The process of decease can involve physical changes in the body, such as the stopping of the heart and brain activity. In medical terms, decease is often associated with specific causes, such as disease, accidents, or natural causes. Understanding the factors leading to decease can help in the prevention and treatment of conditions that may shorten life expectancy.