Hájek's health was poor for many years as he suffered from a kidney disease. By 1970 his condition was deteriorating steadily but he bravely continued his work.
Hájek sa kalusugan ay mahihirap para sa maraming mga taon na siya suffered mula sa isang sakit sa bato. 1970 sa pamamagitan ng kanyang kalagayan ay deteriorating steadily ngunit siya buong giting patuloy ang kanyang trabaho.