Elevated blood pressure, childhood asthma, obesity, diabetes
High blood pressure alone captures 1/3rd of the public, and it qualifies as a underlying condition. 1/2 of the public has "cardiovascular disease". It goes on and on.
It just seems like at this point people are just trying to comfort themselves. A 51 year old gentleman near me passed very quickly from COVID-19 and the report claimed he had a pre-existing condition. Later the wife was interviewed and she described him as completely healthy...but he had bronchitis when he was a child.