Fortunately, NASA's 120 astronauts in space have never encountered such a situation. In the early days, there were problems with Apollo 13 astronaut Fred's urinary infections and minor cases of influenza. The spacecraft always had enough medicine on board to deal with these emergencies. In the event of an accident during orbit around the Earth, astronauts are returned to Earth as quickly as possible, whether on the shuttle or on the ISS. NASA has also developed a large, seven-passenger return capsule for the ISS that is designed to be used as a "space ambulance" in special circumstances.
In the event of a fracture, the spacecraft is also equipped to immobilize bones. When mankind sets out into outer space, such as in the expedition to Mars, the spacecraft will carry medical equipment, and one or more astronauts are well trained in medical knowledge, they can carry out rescue and treatment. This is because in such cases a return to Earth in the short term is not possible. When possible, the spacecraft will be equipped with experienced doctors.