Doctor

A doctor, is a person, or animal (as in the case of Tony Tony Chopper), who practices human biological medicine. A doctor is usually a necessity for sea travel, and they are known as the ship's doctor (船医).

Role and Duties
Doctors are relatively essential members of any crew, whether it be Pirate, Marine or any crew in between. One who is skilled in medicine and health care is necessary in order for the crew to survive the harshness of the sea. Doctors are usually required to heal wounds from battles, or prepare medicine for sick members. Doctors who specialize in surgeries are known as surgeons (外科医); notable surgeons include Hogback and Trafalgar Law.

In terms of Luffy's crew, the issue of having a doctor was first brought up in the Arlong Park Arc, when the doctor of the town, Dr. Nako, said they really needed a doctor, after patching up Zoro's wounds. At the beginning of the Drum Island Arc the need for a doctor became serious as Nami was suffering from a fatal infection. After the Drum Island arc, Tony Tony Chopper joined the crew as the ship's doctor and has fulfilled his duty since then, patching up wounds from battle, and using his knowledge of medicine to the crew's advantage.

Due to the Rumbar Pirates' doctor being killed in battle, the crew had no chance of saving themselves from the poison they were afflicted with, which led to their destruction. This is an example of how much a doctor is crucial in a crew.

Hogback is considered one of the most famous and legendary surgeons in the world, having won all forms of awards and statuses available to doctors due to his miraculous surgical skills and saving as many lives as there are stars in the sky. However, unlike a typical doctor, Hogback has no regard for human lives, and instead would use his talents to turn corpses into enslaved zombies for his own purposes.

From World Government propaganda and fear-based misunderstandings, many doctors throughout the North Blue falsely believed that the Amber Lead Syndrome is contagious, and refused to treat a 12-years old Law, even demonizing him as a danger to the rest of their respective hospitals and attempted to contact the Government to exterminate him with prejudice. This shows the incompetence of many doctors throughout the world as they refuse to even look into the fact that the disease is noncontagious, and blatant disregard for the Hippocratic oath.

It is said that any doctor who ate the Ope Ope no Mi will be able to perform miraculous operations to cure all disease that no ordinary doctor can. Indeed, a doctor who ate the fruit in the past saved many lives with the superhuman power. That being said, the Ope Ope no Mi requires medical knowledge to use to the fullest.

Trivia

 * Despite the essential role they played, pirates rarely had a doctor on board their ship as it was mostly commercial and military vessels that carried a doctor. Even when a doctor was at hand, the standards of medical practice were not as they are in the modern world. Most limbs or lives were lost simply because of the crude methods often used on a patient. Thus, sickness and disease were often common within pirate crews and even the basic standards of living were not always on par with crews on board lawful vessels.
 * Kaya's dream is to become a doctor and is currently studying to become one.

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