Why are insurance companies restricted from selling health insurance to anyone?

"Howmuch is that this planning to cost me? In Illinois was driving without insuranceWhat does an  insurance  agent do?
Did my auto insurance get larger?
"Where do i go to get yourself a test were I've no  insurance "My man and that I require private medical health  insurance  that I am a stayathome mother of our two year old boy and since his career doesn't provide it. We live-in California"I got into a tiny crash today