Diseases

A disease is the manifestation of the malfunction of our body, associated with typical symptoms. Several illnesses have appeared in the One Piece series, whether they are real or not.

Scurvy
Scurvy is a real disease caused by a lack of vitamin C, very common during the Great Navigation period. Yosaku was the one who acquired this disease. The symptoms he presented were: teeth falling out and old wounds opening.

Five-Day Disease
Five-Day Disease is a pathology transmitted through the bite of a tick of the same name, which was a creature typical of ancient tropical forests. It was believed to be extinct, but it survived in Little Garden due to its prehistoric conditions. The bacteria enter the body through the bite, causing a high fever in the infected person and which can lead to death within 5 days. Nami acquired this illness during the Straw Hat Pirates' stay on the island and improved thanks to Dr. Kureha's care.

Diver's Disease
Diver's Disease was an illness acquired by Montblanc Cricket when he dived several times to look for Shandora's gold and prove the innocence of his ancestor Mont Blanc Noland. Due to the decompression suffered by the diver when rising from the bottom to the surface of the ocean, the blood is unable to remain in its soluble state and ends up creating air bubbles inside the body. These bubbles begin to expand in and out of the veins, damaging the bloodstream, muscles and joints.

Tree Fever
Tree Fever is a lethal disease capable of affecting much of the vegetation in a location. A person contracts this disease when consuming an infected product. The only known symptom is the appearance of dark spots on the body. The mortality rate is 90% and the only known cure is the vaccine made from a substance called Quonine, which is 100% effective in combating the disease.

Amber Lead Syndrome
Amber Lead Syndrome is a non-contagious and hereditary pathology caused by amber lead, an ore found in the country of Flevance, also known as the "White City". Amber lead was used in paints, dishes, weapons, among other things. When the lead trade began, the World Government checked the geological properties of the soil and confirmed its poisonous nature, harmless when unexcavated and lethal when manipulated. The symptoms presented are: graying of the skin and hair, body pain and eventually death. Several inhabitants of Flevance acquired this disease, such as: Law's sister, his father and himself.

Unknown disease
An unknown Yorki disease, its symptoms (dark spots on the skin) and the way he contracted it (in a jungle) are very reminiscent of tree fever. However, no link between the two diseases has been confirmed.