1) I read the information on your website about knuckle cracking, and I was wondering if it applies to cracking backs and necks. I know that people often have their backs cracked by friends, etc. because it feels good and seems to relieve tension. Also, when my neck feels tight, I often turn it from side to side until it cracks and feels better. I've heard that chiropractors do some version of this, and call it "realignment." Is this safe? Is there a right or a wrong way to crack a back or neck? Is cracking your back/neck actually therapeutic in some way?

2) As a college student, I sometimes spend long hours reading books or looking at computer screens, and often my neck gets stiff. Like many of my joints that get stiff, sometimes I crack my neck, like I would crack my knees or fingers when they feel stiff. I often wind up doing this several times a day.

My question is, could I do irreparable damage to my spinal system if I continue using this method to soothe a stiff neck? Could I wind up a paraplegic if I continue to crack my neck? Leak spinal fluid, etc.?

Is it true that if you have the seed implant for prostate cancer, the patient can not come in contact with any pregnant women?

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!

Are there different sugar levels in different alcoholic beverages? I am hypoglycemic and have noticed different hangover levels contingent on the sugar level of alcohol consumed. Some have told me that Scotch has the least amount of sugar of all alcoholic beverages. Since I occasionally enjoy a drink, I would appreciate knowing the lowest sugar content.

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?

1) Many people are buying Swarovski crystal beads to make crafts. I understand that they have 32 percent lead. People are making jewelry and figurines with the crystal beads. Is this a danger to our health?

2) We received a 24 percent leaded crystal decanter from Poland as a gift. We would like to use it for a liquor decanter. Is it safe? Are we in danger of lead poisoning?

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.

The muscles in my back become extremely tense/tight throughout the term as I am cramped down studying all the time. What should I do?

Is there any chance that because I get low blood sugar occasionally, I may become a diabetic someday? And what can you keep with you to take when your levels do drop, and you can't get to any food or juice?

I recently had sex in a natural hot spring without using a condom because my boyfriend and I are monogamous. However, I am concerned that I could have gotten some kind of bacterial infection from it. Could this have happened?

Sadly, today I found out that a friend of my family has just passed away. The cause of her sudden death was a brain aneurysm. I have been researching brain aneurysms and have found out that oral contraceptives are thought to sometimes cause them. I am 19 and I am taking birth control, and now I am very worried. Can you give me some statistics about brain aneurysms linked to oral contraceptives? Thank you.

I have heard numerous reports in the media where they make mention of the "live flu virus" in the flu vaccine, specifically "flu-mist." This is mentioned in conjunction with a warning to avoid contact with this and that (yadda, yadda) for a certain time period. This confuses me. I was under the impression that the flu vaccines contain dead viruses and that it was not possible to catch the flu from the vaccine. Which is it?

I'm wondering about Lyme disease and chronic fatigue syndrome — the differences and similarities?

If you step on a nail and have not had a tetanus shot in the last five years, how soon should a person be vaccinated? 24 hours? 48 hours?

I am not actually worried but simply curious. When petting with my boyfriend and getting in contact with his sperm, my skin turns slightly red where his cum touches me. Am I allergic, or is there perhaps any other explanation? I am 24 years old and female.

I use Nalgene bottles for about 75 percent of the water I drink each day. Therefore, I was startled to find out that there is some possibility that these bottles leach chemicals into the water. I've found conflicting opinions about the veracity of these claims on the Internet. What's the truth? Should I dump my Nalgene for glass? You have an earlier post about bottled water, but it doesn't seem to address this issue specifically, and you recommend purchasing reusable bottles like the ones that might be poisoning me. The bottles I use have #7 on the bottom in the recycle symbol.

I just found out I tested positive for high-risk HPV. My pap smears have been normal for years. I'm 45 years old and have had lots of basal cell skin cancer. I'm scared to death of getting cancers that are caused by HPV. I'm so stressed. What are the odds that I will actually get cancer, now that I am supposedly high-risk? It appears there it nothing I can do at all to prevent this from happening other than keeping up with my visits and pap smears and hoping I beat the odds. I just wonder at how much risk am I when they say I am HIGH-RISK???

1) This is in reference to your Missed periods Q&A. Another cause of missed or late periods is PCOS (polycystic ovary syndrome). A lot of health care providers don't seem to be aware of this syndrome. In this syndrome, missed or irregular periods are caused by unusual hormone levels, sometimes in combination with insulin intolerance. Because missed and irregular periods cause scar tissue build-up in the uterus (which may cause endometrial cancer) and may cause infertility, it is important that your readers know to ask their health care provider about this syndrome. There are obviously other symptoms and complications, but I just thought that I might mention it to you so that you might read up on it for your readers. Thank you.

2) I was recently diagnosed with polycystic ovary syndrome (PCOS). I'm only 17 and am afraid that this will affect my chance of having children. Should I worry? Also, I know birth control pills will help me regulate my period, but if I take them, will it stop the effects PCOS has on me? Like me gaining rapid weight, missed periods, and losing my hair? This is really worrying me. Can you inform me on this syndrome?

After a night out with friends, I stopped in a nearby cafe before heading home to use the restroom. Unbeknownst to me, the staff had just mopped the restroom with bleach. Usually, a clean bathroom is a welcome amenity, but this one in particular is very small (barely a water closet) with zero ventilation. Though I was in there a brief time, my eyes and nose began to burn and water, and I could not very well open the door until it was time to wash my hands. It's been well over an hour since I inhaled all that bleach, and my eyes, nose, throat, and lungs all burn. I can't taste anything, and all I can smell is bleach. My head also hurts. I've gotten a lot of fresh air and plan to go back outside shortly, but these side effects have yet to abate. Am I in danger of respiratory damage? Is there anything specific to this situation I can do to alleviate the pain and discomfort?

Thanks for your help.

I am the front man for a heavy metal band that is steadily growing in popularity. During shows, the whole band head bangs, but I seem to go a little bit harder than everyone else. Every morning after a show, I wake up with stiffness, soreness, and slight swelling of my neck and upper shoulders. Lately, I have been thinking that maybe thrashing my head around as if it isn't connected to my body is a bad idea.

My question is this: Does head banging cause any permanent injury that I should be concerned with? If so, how could I head bang differently to lessen the injury?

I have a friend who will be going through chemotherapy and radiation. What can she do to build herself up to keep her body in the best condition possible?

I was wondering if people can die from not going pee. How long can a person go without peeing and, if they cross that line, then what will happen? Also, can you get a blood infection from ignoring a bladder infection?

I want to know if you are able to have anal sex when you have hemorrhoids, and if there is a way that it will only hurt as much as it does to have sex that way without them. And if so, how can I reduce the pain?

I have an invisible disability and I'm really getting into disabilities activism. Even in liberal circles ableism is still pretty accepted and this upsets me. However, when I try to educate people around me, it sometimes goes awry. I had one friend get upset when I called her out for using the word "retard." Another got upset when I pointed out that her Facebook post of inspirational people with disabilities (that just showed people with disabilities doing normal things) was a little offensive and tried to tell her about "inspiration porn." I get that using the word "retard" is normal as is "inspiration porn." I just don't think it should be.

I know my friends are caring, socially conscious people. I expect people to be a little upset, but ultimately I would also expect them respect the fact that it's really not OK to objectify people with disabilities in the way that inspiration porn and the use of words like "retard" do. What I want to know is how do I point out that people are expressing a harmful social bias, without having them get so upset that they write me off as an over sensitive concern troll?

My breast implants were implanted in my body when I was 22 years old. I am now 64 years old and an MRI shows leakage. I am really afraid of having them removed. Am I in danger if I continue with them until I die?

I have two piercings in each earlobe; however I have not worn earrings in the second set of holes for several years. Recently I tried to insert earrings into the seldom-used pierce holes. One earring went in with no problem, but the second did not go through after several attempts (I actually gave up because my last attempt bent the earring post). I have tried inserting other earrings but they also will not go all the way through. Is this something I can fix myself? Do I have to get the same hole professionally re-pierced? Will there be problems with scar tissue at the site?

I have noticed lately that wounds such as cuts are healing much more slowly than before. I have also noticed that I am scarring more. For example, a tiny hole in my hand has developed a scar that is four times the size of the actual injury, and it is slightly raised. Am I missing something in my diet that is causing this? Or could it be an effect from on-going stress and anxiety? I am a vegetarian with some vegan tendencies, and I take a multi-vitamin every day or so.

I am African-American, but my skin is not that dark. I was never told that I needed sunscreen and when I worked in a daycare I was told in a very delicate manner that only the paler children needed sunscreen. I've been out in the sun for extended periods of time and was wondering if sunscreen is necessary for someone of my complexion. If so, what strength?

1) This is sort of an embarrassing question...Recently I found out that there is something unusual just outside of my anus. It has grown like a pea. When I touch it, it is sort of hard but smooth, and it hurts a bit. What should I do? Is this like some kind of cancer?

2) I have this problem and I am too embarrassed to ask a doctor about it. I am a nineteen-year-old male and have this growth in my anus. It popped up about one week ago. It is about the size of a pea. Could it be hemorrhoids? If not, what can it be? Should I be worried, and what should I do about it?

I have been on the pill for over a year now. Recently, I broke up with my boyfriend of two years. We still see each other, but I have not had sex since we broke up. I don't plan on having sex with anybody else. My question is, if I don't plan on having sex for a long while, should I stop the pill? I am afraid that if I decide to get back on the pill, I will have an increased risk of cancer or something like that. Is this true?

What should I eat if I have acid reflux?

I'm about to have rotator cuff surgery and repair some torn muscle. What natural healing foods can I eat to reduce the inflammation as well as increase the speed of healing of the muscle??

If I get hurt really sharply or suddenly, I end up passing out. This has happened once when I slammed my finger in a doorway, once when I bashed my elbow on the shower wall, once when my finger was held in an awkward, painful position, and once when I got a flu shot. Why do I pass out like this, and why do I have such low pain tolerance?

I am a 19-year-old male. Over the past three years whenever I urinate, my urine stream splits in two (one continuous stream and one stream which is basically drops of urine.) Is there something wrong??? I also have another question. My grandfather has prostate cancer. I was just wondering when I should begin checks for this type of cancer.

I need to take an iron supplement and have two concerns: one, I know that many foods interfere with iron absorption. How can I maximize the absorption of any iron (and calcium) supplements? My other concern is that my GI system is very sensitive. How do I deal with constipation that often goes with iron supplements?

I have a question about mumps: I had mumps while I was thirteen-years-old. I remembered that because of embarrassment. I was afraid to tell my parents about the inflammation (swelling of the testicles) at the same time I had mumps. I did not have treatment for the swelling of my testicles due to mumps. Later, the swelling went away about the same time as my mumps. Although I still can produce semen, I am deeply disturbed whether that swelling could have hindered my fertility (i.e., no production of sperm due to the blockage of the sperm channels).

I’m having a burning sensation when I urinate and it still burns after I urinate. Also, I can’t urinate all the way and am continually having to go to the bathroom. I was diagnosed with kidney reflux when I was a child — could this be that?

What causes fever blisters on lips and how should they be treated? Also, what is the difference between fever blisters and shingles?

Wondering if there are any negative effects to masturbation while being sick. I hear it could be a cause of lower immunity levels, is that true?

Is there a link between constant fatigue and serotonin levels?

This week I'm getting my tonsils and adenoids taken out. I've never had surgery before and I don't know what to expect. Can you explain please?!?

After having anal sex with my partner, I noticed blood on him, although there was no sign of external damage. The next day I am feeling pain internally, but I can't pinpoint its location. What are the possible dangers and should I see a doctor?

This may sound like a dumb question... But I really am unsure. What is the difference between a milk allergy and lactose intolerance? Or are they one in the same? I was in an accident when I was 14. I had emergency surgery on my liver and spleen. After about the age of 20, I have developed severe mad dashes to the restroom after eating anything dairy.

But I have a lot of sinus allergies... that seem to flare up after eating milk products. Although generally milk products do cause thickening of the mucus... I was wondering if severe congestion also goes with it? I no longer eat milk products, of course. But I recently read about a child with a milk allergy who could not breathe through his nose afterward... accompanied by severe coughing. I am now 40 and learned my lesson well... But still curious and always looking for additional info and answers!!

I get cold sores around my mouth and nose all the time; I have since I can remember. I know that they can be caused by both physical illness and mental stress. Is there any way to reduce the frequency with which I get them, i.e., diet? Please help me, I feel like a leper.

I have had terrible stomach problems for a few years now. My doctor says it's due to my love of greasy and oily foods, and that I should concentrate on eating healthier, broiled foods. Do you think if I continue on this unhealthy eating cycle, that I could develop gallbladder problems? Also, do you think my diet contributes to my acne-prone skin? Thanks for your help.

I work ten-hour days, four-days-a-week, standing in one spot. The bottom of my feet feel like a lot of needles are pricking my soles. Could you please tell me what could be causing this? Just started about one month ago.