Diseases & Conditions

The human body is a remarkable structure. It's designed to efficiently manage the wear and tear of everyday life and fend off all sorts of threats. Most of us are healthy for most of our lives. But we're also susceptible to hundreds of injuries, diseases, and conditions. Some are quite common, others are extremely rare. Here are some of the most common conditions that affect humans.


Diseases & Conditions Articles

Blinded by the night

Poor night vision is the result of changes in the pupil, lens, and retina. Does eating carrots help? Probably not for well-nourished Americans. It's been said that the eyes are the windows to the soul. At a more mundane level, they also say a lot about how old we are. With advancing years, we're prone to a number of serious — and less-serious (but bothersome) — conditions of the eye. The prime example of a serious age-related eye problem is macular degeneration, a retinal condition that's a leading cause of legal blindness among people over age 55 in the developed world. Age-related nuisances include a falloff in tear production that results in drier and itchier eyes. Eyelids also droop and sag, like other body parts. And starting around the fifth decade, almost all of us suffer from presbyopia (Greek for "old sight"), an inability to focus on objects close to our eyes. (Locked) More »

Thyroid deficiency and mental health

Researchers are exploring a potential link between thyroid deficiency and mental health problems. Though the findings are inconsistent, there is evidence that thyroid medication can help those with depression, even if their thyroid function is normal. More »

By the way, doctor: Does lysine prevent cold sores?

For years, I was plagued by cold sores and took antiviral drugs to treat the outbreaks. But at a friend's suggestion, I started taking lysine every day, and it seems to prevent them altogether. What do you know about this supplement? (Locked) More »

What to do about cataract

For people with cataracts, surgery is common and safe, and is typically covered by insurance. Depending on need and other eye issues, various types of lenses are available. More »