I have a question related to illness...

I have five families on the go, a couple of them have had minor illnesses that I know how to deal with.

However one of my families (just a woman so far), she keeps getting sick over and over and over again...and I don't know why.

Each time it is a minor illness, sneezes, stomach upset - I just give her the medicine and she's fine.

This is unlike my other games, which have had either No illness, or maybe One illness the whole time. She has had at least Five illnesses, and this game is the newest one I've started!

Is it something in the house that might trigger multiple minor illnesses, or something wrong with her that can be cured? I keep having to spend money on medicine, and she's all alone!