. >> thanks for the nyu nod. but he says he has pain.one thing that can happen with simple cysts, and again, we're talking a simple cyst here, it can actually obstruct. so somebody has to make sure that it isn't obstructing the flow through the tubals. now, assuming that that is not the case, you can just follow it. the more complex ones, those are the ones you worry about. talking about kidney cancer for a minute, which we haven't covered here before, what puts you at risk for that, eric? high blood pressure, obesity, the thingsz we were worried about at the beginning of the show. smoking. we're always worried about smoking. and the other thing is workplace exposure. other chemicals can increase your risk for kidney cancer. >> what's your risk for kidney cancer? >> that's the problem. it's another one of these ones where it's difficult to find. you can find it on an ultrasound. again, a cyst that looks abnormal or multiple cyst necessary one place is something that makes you think -- >> and the third is one of them and blood in the urin

. >> thanks for the nyu nod, but, he said he has pain so what can happen with a simple cyst, and we are talking a simple one here, it can actually obstruct so someone has to made sure that it is not obstructing the flow through the tubes. if that is not the case, you follow it. more complex, irregular borders, you worry about that. talking about kidney cancer, we have not covered that. why are you at risk? obesity. high blood pressure. smoking. we are always worried about smoking. also, work-place exposure to certain chemicals that increase the risk for kidney cancer. >> the problem is, it is very hard to find. blood in the urine you look for. you can find it on an ultrasound , if it looks abnormal or multiple cysts in one place. >> or blood in the urine. mark is right, the biggest thing is to spare part of the kidney. >> blood in urine, is that always cancer? >> could be bladder or kidney center. or an infection. >> the hottest political debates is marijuana, medical marijuana, a lot of controversy whether it should be decriminalized and made legal. you should know the effect on your b