My sister has been diagnosed with PSP, and over the past year, has gone from being a healthy, fully functioning woman to basically being on her deathbed. She's lost over 100 pounds, is bedridden now, and barely can eat or drink. It's been so hard to watch her waste away like this. But to make the situation even more painful and confusing, her husband has been sick for the past year as well with vague but growing neurological symptoms, and was just this week diagnosed with ALS (Lou Gehrig's disease). Have any of you heard of the possibility of an environmental cause for PSP? It just seems too coincidental that two people living in the same house together--both apparently healthy just a year or so ago--suddenly both develop rare and fatal neurological diseases. Our family has asked the doctors about this and we've been told that no, and environmental cause doesn't seem to be a likely connection between the two. I know that random coincidences can happen, but it all just seems too much to believe in this case. I'm sorry for all here who are suffering with PSP, or connected to someone who has it. It's truly heartbreaking for all concerned.