My question is probably too specific, but I hope that you mightb have heard the terms I'm going to ask about and will recognize at least some of them:
1) When a person has several diseases, but one disease is the most serious and is treated most intensively, can we call this disease "fundamental disease/illness"?
2) When a person has several diseases, but none leads to death separately - only together they can result in death or other serious consequences. Is it "combined disease"?
3) Concerning 1) - if there is the main disease, are others called "coexistent diseases"?