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Why do we say 高血圧の人 but 肺の病気がある人？
高血圧がある人 would be unnatural, would it?
If we are to use がある for people with a particular disease (which high blood pressure is not), why are ＡＩＤＳの人 and 糖尿病の人 ok but not ＡＩＤＳがある人 and not 糖尿病がある人？
Perhaps, it’s about a disease name… if there’s the name of a condition mentioned, then がある will not work… Does that make sense?
It is because 高血圧 is not a disease for which physical presence is felt. As you guess, 高血圧があるひと is not natural but not impossible. For comparison,
I suppose 肺の病気の人 is avoided in order not to use の-phrases consecutively. 病気の人 is normal for a sick person while 病気がある人 is basically the same but sounds more like a person with particular (persistent) diseases.
