Hello, for about two to three weeks now I've been having pain in my knees, but my right knee the pain is more severe and swollen. It's unbearable to get on my knees or put any pressure on them. And it also hurts to bend it and when standing from a sitted position it hurts? I have not injured them in any kind of way so I'm kinda freaking out as to why this is happening. Please help, I always think the worse of things so my mind goes right to Cancer or something crazy?