Yes, all major cruise ships are essentially "floating cities" and are required to have licensed doctors and nurses on staff 24/7. Most large ships carry at least two doctors and three to four registered nurses. The onboard medical facility, usually located on a lower deck, functions as an urgent care infirmary rather than a full hospital. It is equipped to handle minor illnesses (like motion sickness or norovirus), stabilize patients during life-threatening emergencies (such as heart attacks or strokes), and perform minor surgical procedures. The facilities are required to meet standards set by the American College of Emergency Physicians (ACEP) and include equipment like defibrillators, X-ray machines, and lab testing capabilities. In severe cases where a patient requires long-term intensive care or complex surgery, the ship's medical team will coordinate a medevac (medical evacuation) via helicopter or divert the ship to the nearest port with a land-based hospital. It is worth noting that medical services on a cruise are not free; they are typically billed to your cabin account and can be very expensive, which is why travel insurance is highly recommended.