I just found out that a friend requires a kidney transplant. I've heard that we are all equipped with two kidneys and can live with just one. How do I find out if I can donate a kidney? What's involved in a kidney donation? Thanks!

About six months ago, I experienced pain when urinating after having intercourse. Typically, I have pain/burning the first time I urinate after sex, but then the pain tends to go away or diminish. I am a 38-year-old male. I have no pain otherwise.

I have trouble following spoken speech. It's always made school difficult for me and now it's one of the reasons why I think I'll have to quit college (I'm on leave right now). I would listen to lectures or go to instructors for extra help, but my brain just wouldn't absorb anything it heard. This put a huge burden of self-instruction on me and it made it impossible for me to participate in class discussions.

I think this tendency affects me in other ways too. For example, I don't and never have been able to sit through movies or watch TV — I never know what's going on in them. In daily interactions I manage OK with processing short exchanges of information or instructions, but I don't have "conversations" at all unless it's absolutely necessary, and when I do it's exhausting and unpleasant (I speak VERY little and have never had a friend, so it's no exaggeration to say that I don't have conversations).

Until college, I was always able to compensate for this difficulty by just studying hard and teaching myself. I got high grades and was going to a reputedly good college. Can you suggest any explanation for a problem of this sort and how to deal with it so that I might be able to graduate from college?

I was hoping you could answer a question for me about birth control pills. There is a history of breast cancer in my family (my mother). Is it true that because of this, it is unsafe for me to use birth control pills? A few friends have recently had condoms break during sex, and I am looking for a type of "backup" contraception system.

I have been a Type II diabetic for several years. I am now told I am beginning to show kidney insufficiency — is there a diet, or can you tell me where to find diet information of foods that a diabetic can use that are lower in protein and/or a renal diet?

I relocated to a new area within the past six months. Since then, I have been experiencing congestion in the morning and pressure in my sinus area, such as stuffed nose and difficulty breathing, at night when I lay on my back and in the morning. Although I do not have a cold, I seem to always have a small amount of drainage on a daily basis. Within the past week, I am sneezing quite a bit in the mornings and at night, my eyes are so itchy I can't help but rub them to a nice shade of red. I have never had allergies before, just for your info. Thanks for any tips.

I have had Crohn's disease for 16 years and am in remission right now. Recently my boyfriend and I have been toying with the idea of anal sex, but I'm concerned about it given my health issues. I have a lot of thickening of the terminal ileum walls and worry that the "trauma" of anal sex could set off a flare up and be painful because of the narrowing. Any thoughts? I'm way too embarrassed to discuss this with my male doctor. Thanks!

My boyfriend doesn't "pre-cum." Could there be something wrong? Or is it common? All the other guys I have been with have not had this problem.

I am in need of bunion surgery, and it is something I must get done in the near future. My question is this: Will I be able to wear high heeled shoes again? I've gotten away from the pointed toes, but I do love high heels.