What risks did Jacques Cartier and his crew face?

Jacques Cartier and his crew members suffered from scurvy, a disease caused by lack of Vitamin C. This happened on his third journey in 1541. This happened because Cartier and his crew weren't prepared for harsh winters in Canada. One fourth of the French there died.Luckily, Huron chief Donnacona made them a special tea out of tree bark which cured the French there. Hope this helps!