Big Boned
When I was fifteen years old I was suffering from dizzy spells and constant tiredness. They figured I had some kind of anemia. I had a blood test done on me and they found an abnormally highly white blood cell count.
This usually meant one of two death sentences. Leukemia or sickle cell anemia. Turns out I had a one in a million third option.
Genetically I have much denser bones than a normal person.
The doctor was suspicious of this when it took such an abnormally long time to get a bone marrow sample. Usually it’s done in five minutes, it took him nearly twenty to jam the needle into my sternum.
Denser bones meant accounted for higher white blood cell count. I was, and remain to do date over thirty years later, perfectly healthy. Story credit: Reddit / Patches67