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105
votes
6answers
5k views

How can I protect my eyesight when using computers?

My job requires long periods of computer screen use. I have good eyesight (20/15) and don't wear glasses, but I definitely notice my eyes feeling fatigued at the end of the day. Sometimes when I'm ...
61
votes
3answers
4k views

What's the best long-term sitting posture?

The received wisdom seems to be that bending forward for prolonged periods of time is bad for the back. Fine. However, the "received wisdom" has been, for a long time now, that sitting bolt upright ...
47
votes
2answers
1k views

Is there any health risk in cellular phones?

Cellular phones are taking ever increasing part in our lives, and I keep hearing people saying they are harmful to our health. Are there any scientific researches so far proving or disproving those ...
42
votes
2answers
3k views

Can MRI scans be dangerous for one's health?

Can MRIs have any deleterious effect on one's health? Or would it be safe to have say 5 MRIs per year?
42
votes
2answers
2k views

Is food prepared in a microwave oven less healthy?

There are people who avoid preparing their food in microwave ovens for various health-related reasons. The claims most often stated are: Microwave radiation is harmful. Microwaving destroys vitamins ...
42
votes
1answer
3k views

How many eggs can one eat per day?

I've read conflicting information on how many eggs one can eat per day: Daily Health Post - How Many Eggs a Day Can You Safely Eat? How many eggs a day can you safely eat? Apparently, as many as ...
39
votes
3answers
1k views

Are there any health benefits to male circumcision?

It's been argued by various medical organizations that male circumcision has various medical benefits, such as reducing the risk of catching HIV, or reducing the risk of urinary tract infections, for ...
39
votes
4answers
1k views

Are organic foods healthier than conventional foods?

There is a popular perception, and many marketing claims, that organic produce (and food in general) is healthier than food grown with conventional methods. Most commonly, the reasons given are: less ...
38
votes
4answers
2k views

Is eating spicy hot (pungent) food (hot chilli & peppers etc.) healthy or harmful?

I love all kinds of pungent food such as chili peppers etc., the hotter the better. I'd like to know, are there any significant dangers or benefits related to consuming them?
38
votes
2answers
1k views

Is it helpful to a dentist to report pain during a procedure?

Suppose that a dentist is doing a standard dental procedure, e.g. drilling out decay, on me, and I start feeling pain as he does it. Assuming that I can handle the pain silently, so I don't need to ...
36
votes
4answers
1k views

Do vaccines cause autism?

It seems the question of vaccine harm has been around at least as long as vaccines1. Specifically, the claim that vaccines can cause or contribute to autism has been hotly debated in the last decade. ...
36
votes
2answers
1k views

Does the lack of sleep affect my health?

In the past month, I've been really busy with the university and stuff, and I don't sleep as much as I used to. I usually sleep 4-5 hours a night. I haven't been doing that extensively ( I always ...
35
votes
1answer
27k views

What are these lines in teeth?

The following tooth cracks are noticeable when a torch is shining on them (without the torch, they aren't visible). Are they serious? How viable are the teeth, and might they need to be replaced ...
34
votes
1answer
6k views

What is excess blood from blood donations used for, and do we ever run out?

I regularly donate blood, however, I am curious as to what happens to my blood after I donate. Obviously some of it will go to people in emergency medical situations, as I intend. However, I have ...
33
votes
1answer
1k views

What effects does alcohol have on underage children?

In most countries, there is a legal drinking age: 21 in the U.S., 18 in most European countries. I've always been told that legal drinking age is in place because alcohol has harmful effects on ...
31
votes
2answers
844 views

If human life is so long largely due to modern medicine, does every illness shorten lifespan?

One of the most often-cited facts about human life, compared to those of other animals, is that the main reason we live so much longer is modern medicine. Because we can treat illnesses that would ...
30
votes
2answers
539 views

Is there evidence that eating too much sugar can increase the risk of diabetes?

I'm sure this question is asked a lot. I asked it of two different doctors myself recently, one of them a diabetes specialist. They both said that causing too much sugar did increase the risk. Neither ...
30
votes
3answers
4k views

How can I prevent a cold from spreading to the people around me?

I have to attend classes at the university, band rehearsals, I live with my family, so I come close with many people during the day. I have to meet most of these people on a daily basis, even when I ...
28
votes
2answers
34k views

Why do I feel shaky after only a small amount of caffeine?

I like coffee, but caffeine seems to 'wire' me much more extremely than most other people. I feel energized or even shaky after less than half a normal cup, and a whole 8 ounces will usually cause me ...
27
votes
3answers
7k views

Why do doctors prescribe steroid tablets even though they know the side effects?

Sometimes doctors prescribe steroid tablets to suppress pain for diseases, such as arthritis. Why do they prescribe it even though they know the side effects?
27
votes
2answers
4k views

What are known health effects of smoking e-cigarettes

E-Cigarettes have been recommended by a fair share of physicians as a substitute for cigarettes because they are supposedly healthier. What is the scientific consensus on the health effects of e-...
27
votes
1answer
91k views

Is it better to sleep without a pillow?

I have read several web pages that mention the potential benefits of sleeping without a pillow. Examples: http://www.newhealthadvisor.com/Sleeping-Without-a-Pillow.html Is Sleeping Without a ...
26
votes
2answers
488 views

Do zinc lozenges really help the common cold?

For years I've been seeing advertisements for zinc supplements for the common cold, and I've heard recommendations from people who swear that they work, either wiping out a cold completely or ...
25
votes
4answers
6k views

What should I consider when deciding to remove a blister or not?

While playing indoor soccer a couple days ago, I was fouled and fell forwards so that my hand skidded across the court a bit. It left the blister as you see in the image here: What should I consider ...
25
votes
2answers
1k views

Is drinking water during or after a meal better?

Is it better to drink water during or after a meal? Clearly, there are different opinions about this topic. In this Mayo Clinic article, it is mentioned that drinking water immediately after or ...
24
votes
1answer
3k views

What should I do if someone has a seizure in front of me?

What first-aid measures should be taken when someone is having a seizure?
24
votes
2answers
33k views

Does hot water kill germs better than cold water?

I was recently told that I should use hot water to wash my hands rather than using cold water because the hot water will kill germs better. The person who told me this isn't a very reliable source, so ...
24
votes
3answers
7k views

When does the use of headphones become harmful?

Generally, it is known if you listen to music through headphones a lot of time, you damage your ears. But how long should I use the headphones? And how loud can they be so as not to affect my hearing?...
23
votes
1answer
411 views

Are alternative sleep pattern viable?

I'm curious about possible health consequences of polyphasic sleep patterns, which involves sleeping multiple times in a 24-hour period — usually more than two, in contrast to getting all sleep in one ...
23
votes
2answers
4k views

Effect of the common cold on the immune system

I've heard that once a person catches a cold, his whole immune system becomes weak and is affected. In what way does having a cold influence the immune system? If it does weaken it, how can one keep ...
22
votes
6answers
11k views

Is it advisable for a healthy male in his early 40s to take the influenza vaccine?

Influenza vaccines do not have satisfactory effective rates of preventing flu. Flu vaccination reduces the risk of flu illness by between 40% and 60% among the overall population during seasons when ...
22
votes
2answers
11k views

Why should I avoid milk when on antibiotics?

I'm taking antibiotics (specifically, amoxicillin clavulanate) to fight off an ear infection. As she prescribed my antibiotics, my doctor told me not to eat milk products for a few days, then only eat ...
22
votes
2answers
551 views

Is rapid weight loss unhealthy?

A commonly quoted figure is that 1-2 pounds (0.5-1 kg) a week is a healthy rate at which to lose weight, and that 'crash diets' are bad for you. What is this figure based on, and in what way is ...
22
votes
2answers
603 views

How to avoid fatigue if I foresee irregular sleeping time?

Let's say normally, I go to sleep at 00:00 and wake up at 08:00. I know that 3 days from now, I will have to work in another city for just that day and wake up at 05:00 to account for the travel time. ...
22
votes
3answers
409 views

Why is sitting for long periods unhealthy?

Discovery called sitting "the new smoking", and while this is somewhat hyperbolic, there seems to be hard data that indicates sitting (e.g., at a desk) for long periods of time is unhealthy (1, 2). ...
22
votes
2answers
884 views

Are artificial sweeteners safe?

There seems to be a lot of noise about health risks of consuming artificial sweeteners, especially aspartame and saccharin. Many sources argue that these chemicals carry huge risks of developing ...
22
votes
1answer
1k views

How often should I use mouthwash?

I recently started using a mouthwash recently (Yes, I recently started taking care of my teeth more) However, I've read that (I'll link when I find the article again) mouthwashing everyday doesn't ...
21
votes
3answers
7k views

Father gets chickenpox, but doesn't infect his two children. How is this possible?

My brother in law got chickenpox, yet somehow he didn't infect my two nephews, even though they are living together. According to wikipedia, varicella has an infection rate of 90%: Varicella is ...
21
votes
4answers
670 views

How much coffee can a healthy adult drink?

How much coffee can a healthy adult drink before it starts to affect them in a bad way? For example, some friends of mine get headaches if they drink more than 2 cups in a single day.
21
votes
2answers
5k views

Do we produce Vitamin D in the shade?

Do our bodies produce Vitamin D in the shade? If so, what is the percentage decrease in the amount of Vitamin D produced compared to full exposure to sunlight? For example, sitting outside in the ...
21
votes
1answer
400 views

Is there any evidence for health benefits from cannabis?

From the Wikipedia article on medical cannabis: The Cannabis plant has a history of medicinal use dating back thousands of years across many cultures. Its usage in modern times is controversial,...
21
votes
1answer
850 views

How do I know if I'm flossing correctly?

I recently started flossing regularly. However, I'm not sure if I'm doing it right because sometimes my gums bleed. If I floss the right way, should it never bleed? Aside from bleeding, how can I ...
21
votes
2answers
6k views

Should we rinse with water after brushing our teeth?

I've heard that rinsing with water after teeth brushing lowers or negates the benefits that fluoride provides to our teeth, but I've also heard everything in between; from there's no problem with it, ...
20
votes
6answers
6k views

What to do if someone breaks a bone?

I was wondering today about what someone should do immediately after either they or someone else had a fractured / broken bone. What first aid / steps should be taken after this happens? Is this ...
20
votes
2answers
326 views

Is HIV the cause of AIDS?

That HIV causes AIDS always seemed like an obvious fact to me, this seemed to be the widely accepted opinion. But just now I found the article "Questioning the HIV-AIDS hypothesis: 30 years of dissent"...
20
votes
2answers
6k views

Why do drugs expire?

I've googled through internet, and all I found was "what expiration dates mean". I found nothing about the underlying mechanism of expiration. As drugs are chemicals, why do they expire? Are there ...
20
votes
2answers
347 views

How cautious do I need to be with unvaccinated students around newborns?

I teach martial arts, and my wife teaches dance. I know of one student for sure (And I would presume that there are at least a few others) that have not received the normal United States progression ...
20
votes
3answers
1k views

Can being cold or wet be a significant influence in getting the common cold?

As most people know, it's a common thing to say something like "better wear a sweater, otherwise I'll get the cold tomorrow." In my limited understanding, the common cold is caused by a virus. How ...
20
votes
2answers
677 views

Is it better to eat fruit as they are, than to have them in liquid form?

For example, I have 4 oranges. I can either eat them whole (assume I consume every last bit of the flesh) or blend them into a juice and drink it (assume I consume every last bit of it). Which is ...
20
votes
2answers
412 views

Is there any proof that acupuncture is an effective pain remedy?

I have heard of acupuncture being used for pain management. Are there clear scientific proofs that indicate it is more effective than a placebo treatment for pain? If so what types of pain has it ...

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