Yes, virtually all commercial cruise ships carrying more than a few dozen passengers are required to have at least one licensed physician and several registered nurses on board. According to standards set by the American College of Emergency Physicians (ACEP) and the Cruise Lines International Association (CLIA), these medical professionals must be available 24/7 for emergencies. On large "mega-ships" in 2026, you will often find multiple doctors and a staff of three to five nurses. These onboard medical centers are equipped to handle everything from minor ailments like motion sickness and respiratory infections to life-threatening emergencies like heart attacks or strokes. While they function as advanced infirmaries rather than full hospitals, they contain digital X-ray machines, EKG equipment, lab testing capabilities, and a stocked pharmacy. It is important to remember that these services are not free; they are typically billed to your onboard account and can be quite expensive, so having travel insurance that covers "emergency medical" and "evacuation" is a must for any cruiser.