The spleen has several important functions in the human body, the leading of which is protective Therefore, its removal is often not safe, but is accompanied by various complications, primarily infectious and vascular, which can occur even 20 years after surgery. The most serious consequence of asplenia is the development of instant sepsis, which is accompanied by mortality of up to 70%. Therefore, it is important, first of all, to prevent infection in these patients. Using the literature from the MedLine database, modern ideas about the immunological function of the spleen, the pathogenesis of complications and the main ways of prevention, including the use of vaccines, antibiotics, are described. Particular attention is paid to the awareness of people with asplenia or hyposplenism.