Stress is a state of physical, mental or emotional strain. If not managed effectively it may lead to a wide array of health problems and can be a significant factor in many serious illnesses.
Physiological response to stress can include increased secretion of adrenaline, a rise in heart rate and blood pressure, muscular tension, digestive disorders, higher levels of cholesterol, nutritional deficiency, suppression of the immune system and changes in blood composition. Many psychiatrists view stress as a common precursor of back problems, irritable bowel syndrome, chronic fatigue, anxiety and depression.
Modern psychological theory has identified that repeated behaviour can eventually become habitual. The brain builds up and stores a behaviour pattern so that the response to a particular situation starts to feel instinctual and operates like an underlying, core belief. Automatic (instinctual) responses or perceptions generate emotions. These emotions arise before conscious thoughts and the more emotional we are, the more difficult it is to think clearly.