Ricket, scurvy, hepatitis, malaria, halitosis, scabies, and any number od venerial diseases. They got scurvy that was why they walked with their backs bent over and with a cane, they needed an apple a day to keep the doctor away-apples provided the nutrients that were essential for proper bones. Currently books on pirates are populaer-I'm writting one. One interesting disease that pirates sometime suuffered from was psittacosis, also known as parrot fever. It is a disease of parrots but can be transferred to humans by the inhalation of dust from dried parrot dung. Infected humans suffer from extremely high temperature leading to pneumonia and if untreated coma and death. And is also so deadly you only get this in hot places. more