Stress is an overload to the nervous system.
This can be a physical overload, such as an accident, or a mental overload, do to excessive work and responsibility, or an emotional overload, possibly from the loss of a loved one. Stress can come from the environment in the form of air pollution, noise pollution, or toxins in the food we eat. Stress weakens and causes damage to the nervous system. It accelerates aging and if allowed to accumulate will translate into disease and a disruption of homeostasis. Stress invokes the fight or flight response, causing the production of adrenaline and cortisol in the blood stream, which suppresses the immune response, thus making us more susceptible to infection and disease.