There are major fears that a greater or lesser extent, may be exposed to people. It is the fear of death, fear of the unknown, fear of being alone, fear of betrayal. In any case, the fear - one of the strongest human emotions and the effect of it on human health is undeniable. In addition, these fears incorporated a lot of other experiences and concerns, which are due to our fears. So undesirable change originates in the fear of the unknown; experience financial losses and worry about their own health stem from the fear of death; fear of separation or divorce is rooted in the fear of being alone; distrust due to the fear of betrayal.
In terms of physiology and medicine, fear affects the cardiovascular system, adrenals, reproductive system and the immune system. Creating a feeling of anxiety, fear causes an increase in the level of adrenal hormones, particularly cortisol increases - a hormone that affects the metabolism, improves heart, causing spasm of peripheral vessels and lowers immunity. As a result - exposure to bacterial and viral infections, autoimmune disorders, cancer. A state of chronic stress can lead to diabetes, gastric ulcer and duodenal ulcers, degenerative diseases of the central nervous system such as multiple sclerosis, hypertension, heart failure, asthenoneurotic syndrome and a number of psychiatric problems such as personality disorder with a passive-aggressive behavior, obsessional neurosis, paranoid schizophrenia.