Tiredness is, without a doubt, the most common subjective disorder that every man occasionally complains about. Some are tired because they do nothing, others because they work too much, others are tired "from everything". Chronic fatigue is a disease of our time. Millions of people in civilized society haunt dispensaries every day, complaining that they are exhausted, exhausted, dead tired, and a doctor cannot determine the physical and psychological causes of their problems by any examination. Tiredness cannot be limited, localized, and affects the whole organism and is a set of many mental and physical symptoms, from muscle pain, physical exhaustion, trembling, to feelings of lethargy, inability to concentrate, headache, impaired reflexes, loss of appetite, decreased function of certain organs (sight, hearing), disturbed sleep, digestion, etc.

Fatigue is usually divided into physical and mental, although they are most often interconnected so that it is difficult to distinguish one from the other. In the brain there is a center responsible for the feeling of tiredness which can be irritated by the breakdown products that accumulate in the body during physical work, eg lactic acid, ammonia, etc. The center also irritates the reduction of "fuel", blood sugar, lack of oxygen, reduction of some minerals, loss of body water. Such physical fatigue is useful because the body warns with fatigue to stop working in order to recover for new efforts.

We are less perceptible and understandable mental fatigue. It is known that the fatigue center can be irritated by psychological factors, such as fear, insecurity, boredom, loneliness, emotional tension, etc. These psychological factors are the cause of chronic fatigue, a new epidemic of modern society. Today's man experiences constant mental strain and stress either at home or at work. Family conflicts, dissatisfaction in the workplace, disturbed interpersonal relationships and permanent frustration, ie constant experience of failure and disappointment, lead to fatigue becoming a conscious or unconscious "mechanism" for getting out of work, in fact the most significant reason for illness.

A significant factor in workplace fatigue is monotonous work, work without movement, often under time pressure, e.g., working on a conveyor belt. It adversely affects the entire nervous system noise and work in shifts that completely disrupts the rhythm of day and night. These are the reasons that lead a man to go to bed “dead tired” along with his worries. Understandably, he cannot fall asleep which intensifies the feeling of physical and mental exhaustion. Since many of the symptoms of tiredness are accompanied by various diseases, patients most often associate their feeling of tiredness with some physical disorder, interpreting fatigue as a sign of an organic disease - "I am sickly tired".

Many acute and chronic diseases begin and end with a state of severe fatigue. Thus, for example, fatigue regularly announces the flu. Feelings of general malaise and fatigue persist for a long time after the illness, often accompanied by fever or some other sign of illness (typhoid fever, contagious jaundice, inflammation of the brain, etc.). Occasional fatigue can herald diseases such as high blood pressure, malignant tumors, joint inflammation, multiple sclerosis, long-term and severe illness of unknown cause. Rapid fatigue with weight loss and dark skin color is accompanied by impaired function of the adrenal cortex (Addison's disease). Vitamin B deficiency leads to fatigue accompanied by diarrhea, itchy skin, muscle sensitivity and nervous and mental disorders (pellagra, beriberi). It is generally known that fatigue accompanies chronic diseases such as tuberculosis, anemia, renal failure, etc.

Because fatigue accompanies many, often severe and deadly diseases, every person suffering from chronic fatigue must be medically examined. The treatment of fatigue depends on its cause. If fatigue is just a symptom of a physical illness, then treating the underlying disease also removes fatigue. Treating physical fatigue is simple. The most natural way to treat physical fatigue is to rest. It is necessary to balance work and rest. Bath, massage, physical and mental relaxation and good sleep regularly lead to a speedy recovery. Good sleep best recovers the mental and physical strength of the body.

In addition to passive rest (lying down, sleeping, sitting), which is useful only to eliminate fatigue caused by physical work, there is also active rest. Active holidays include physical activities: walking, sports games, gardening. Proper active rest has become a necessary need to restore the disturbed mental and physical balance. The essence of rest is that a person feels free from all duties and pressures. If, in addition to physical fatigue, there is constant worry, anxiety, etc., fatigue will not be removed until emotional conflicts are resolved, until the problems disappear. In such cases, psychotherapy is needed.

If tiredness is chronic, the causes are usually very complex and unclear. In some cases, in the industry, various measurements are used to determine the degree of physical fatigue. Mental and physical functions are being examined, but there are still no reliable examinations and tests that could be used to identify, measure and define “objective tiredness”. Fatigue is still primarily an intimate, subjective feeling, a phenomenon of personality, the psyche of the patient that most often becomes the only object of treatment and the main factor of healing.