What's the medical condition Whitebeard has? Whitebeard had a clear medical condition and it seemingly wasn't just old age. What was it, and why does he have it?

What did it impact?
According to the One Piece Wikia, it is just old age.


  While not in battle, Whitebeard was typically on oxygen and attached
  to several medical sensor machines, due to health issues concerning
  his age.