In sinus bradycardia, there are usually physiological and pathological causes. Physiological factors are common, for example, in young athletes, manual laborers or after sleeping at night, and in elderly people, who also have sinus bradycardia, which usually does not require treatment. For pathological sinus bradycardia there are often the following factors, first of all, increased excitability of the vagus nerve center, such as meningitis, cerebral hemorrhage, increased intracranial pressure due to tumors in the head, neurosis, vasopressor deficiency, all of these conditions can cause sinus bradycardia. In addition, reflex vagal excitation, such as pressure on the eye, pressure on the carotid sinus, stimulation of the throat, acute gastric dilatation, intestinal obstruction, urinary stones, and gallstones, can also cause sinus bradycardia. Finally, severe metabolic disorders, such as hypothyroidism, hypopituitarism, severe malnutrition, and severe hypothermia, can trigger these conditions.