Yes, all major commercial cruise ships are required to have licensed medical professionals on board, typically consisting of at least one doctor and multiple nurses. These medical teams are equipped to handle a wide range of issues, from minor sea sickness and respiratory infections to serious emergencies like heart attacks or broken bones. Modern cruise ship "infirmaries" function like mini-ERs, featuring X-ray machines, lab equipment for blood work, and pharmacy supplies. As of early 2026, new industry regulations also require CLIA-member ships to have doctors trained in Point of Care Ultrasound (PoCUS) and to carry advanced diagnostic equipment to better manage trauma and cardiac events at sea. While these doctors are highly skilled, the medical facility is not a full-scale hospital; in the event of a critical life-threatening situation, the ship will coordinate a medical evacuation via helicopter or divert to the nearest port. It is important to note that medical care on a ship is not free and is rarely covered by standard health insurance, making high-quality travel insurance essential for every cruiser.