It is common for cells to have errors when copying DNA, it would be UNcommon to not have survived cancer (at that scale). It is even explained how your body deals with cancer cells constantly (vol2 ch9 pg 24 for ref), cancer becomes a real problem when your body cannot remove it in time and it actually does become a massive issue.
This person is most likely an avid hiker or tourist, constantly exposed to many dangers and experiences. Considering there have been people who have been struck by lightning multiple times and still live might give you some insight as to how normal this is.
Don't forget dengue! It's more prevalent in the tropical areas. The symptoms were really downplayed here. It's not just fever and headache and cough.if tge fever passes without being treated, the platelet count drops down like crazy, causing a need for blood transfusion. Your skin breaks in hives. It can kill, especially the young.
Bleeding out is def not normal
Let's think about this...
This guy's body has had multiple bacteria and viruses, fine... BUT THIS PERSON'S BODY HAS SURVIVED THROUGH AN INTESTINAL PARASITE, CANCER, NOT ONCE BUT FUCKING TWICE AND NEARLY BLEEDING OUT!
FUCK THE CELLS INSIDE, I'D LIKE TO KNOW THE STORY OF WHAT THE HELL THIS PERSON DOES TO HAVE ALL THESE AILMENTS! (╯°Д °)╯╧╧