I am 51 and in a demanding job that knackers me (lecturer) and have felt unwell for about 6 months. Have visited gynees on and off for a few years due to fibroids. Was told I need hysterectomy in 2011 but decided the fibroids detected wold disappear with menopause. Thought I was my own physician! Fast forward to present. In past 3 months I got a huge tummy, back, chest and kidney pain. Increasing pain up and down legs and in feet. Culminated in seeing doctor then very swift referral to hospital for pelvic scan. Blood ca125 level is 67. Had hysteroscopy and awaiting results. My cat is even more loving and affectionate than ever (if that's possible). He scrutinized me for quite some time prior to the scan and stared (alarmingly) at something that was absent, above my head. He is a very knowledgeable cat (he knows everything) and I know his stare was significant. I kind of know that something is probably seriously wrong because my walking is becoming difficult - though I battle this like a bee. I suspect I have stage 3/4 ovarian cancer. My question is: how do cats know?