SSDI

I knew quite few of friend's husbands (3 of them to be exact) who are fortunate enough to get social security disability. Although we knew that there are only small percentage of population with disabilities only qualify for SSDI. Somehow another friend who are seriously injured and filed for disability compensation was denied. It was extremely difficult in her part since she can hardly work anymore and SSDI is the only way she can get compensation. I don't know much about SSDI. It just puzzled me of how or why people qualified or not. Seems like it was easy for some other people to get benefits but others who has worst case will get denied. Well, like I said, i do not know and their whole situation though.