"No apparent cause." That doesn't mean there is no cause. Doctors just don't know what it is in that case, which is my point. It's the same with cholesterol lev

"No apparent cause." That doesn't mean there is no cause. Doctors just don't know what it is in that case, which is my point. It's the same with cholesterol levels now. It used to be you got high cholesterol "from eating too much cholesterol" until they realized some people just have high cholesterol regardless of what they eat. So they continue to seek a cause.