Homeostasis refers to the process by which the body maintains a stable internal environment despite changes in external conditions. This includes regulating various physiological parameters such as body temperature, pH levels, electrolyte balance, and more.
Stress, on the other hand, is the body's reaction to a threatening, challenging, or disturbing event. When the body experiences stress, it triggers a series of physiological responses known as the "fight or flight" response. This response can disrupt homeostasis by altering heart rate, blood pressure, and hormone levels, among other things.
In summary, while homeostasis is about maintaining stable internal conditions, stress is a reaction to external challenges that can upset that balance, leading to various health issues if prolonged or severe.