Normal fatigue always goes away after rest. In this case, working capacity is restored, mood improves.
But if the problem does not go away even after a long vacation, then you should see a doctor. There is a risk that the person has a disease that is only "masked" as fatigue.
Neurologist Olga Golubinskaya spoke about this during an interview for Sputnik radio.
It is a bad sign if the feeling of fatigue does not leave a person. This may indicate mental disorders, diabetes.
After all, such illnesses disrupt the function of the thyroid gland.
It is also worth noting that chronic fatigue is a sign of depression.
Chronic fatigue is a symptom of depression, subdepressive state, psychosomatic syndrome or somatoform disorder.
In addition, as Golubinskaya noted, all disorders are accompanied by problems with appetite, decreased interest in life, and sleep disturbances.