Hospital admission is necessary for yellow fever patients when symptoms worsen, particularly if they enter the toxic phase, which includes severe jaundice, bleeding, organ failure, or a sudden decline in health. Early admission may not be needed for mild cases where symptoms are limited to fever and muscle aches, but hospitalization becomes critical if complications develop. In severe cases, intensive care might be required to manage dehydration, organ failure, and bleeding. Early medical attention is important, especially for high-risk individuals.