Harvard Health Blog

The thymus gland is very important in the development of the immune system during fetal growth, infancy, and early childhood. As we grow into adulthood the thymus shrinks, but growing evidence suggests the gland may play a role in adult health for much longer than previously thought.

Healthier eating starts with food shopping, and supermarkets are full of choices that are both nutritious and less so. But trips to a grocery store don't have to feel overwhelming or be budget-blowing; it just takes a little planning, strategy, and thinking ahead.

In the US population as a whole, deaths from colon cancer have been declining, but in people under 50 that rate has increased. Most major medical organizations recommend screening beginning at age 45 for people at average risk.

Removing tonsils in childhood was once routine care for healthy children, but is no longer recommended. Why are some organs and glands — appendix, tonsils, adenoids and more — considered expendable and why do we have them if they're not needed?

Without enough quality sleep, children are more likely to have health and behavioral problems — and difficulty learning. Here are a few simple things you can do to help your child get the sleep they need.

The tongue's appearance gives doctors an idea about certain aspects of your health, and its color is an important clue. Some changes in the tongue's color or appearance are signs of health issues and should be seen by a doctor.

Ads for products that promise to supercharge the body's immune system make claims that sound too good to be true. But do these products actually work? 

RSV is a common virus that just causes cold symptoms for most people. But for infants up to eight months, and for babies and young children with certain health problems, it can be very dangerous. A new immune-boosting shot may help.

Nail fungal infections affect up to 14% of the adult population. While completely curing these infections is difficult, the right treatments can discourage the problem from spreading and make your nails look better.

A new technique for prostate cancer treatment can limit side effects from radiation therapy. It relies on specialized types of medical imaging scans that allow doctors to visualize the cancer during treatment.

An ad for a medication featuring a person sitting on a toilet in multiple settings is eye-catching, but as with most drug ads, it doesn't provide some important information — such as common symptoms of the condition the drug is meant to treat.

Miscarriage describes a pregnancy loss before 20 weeks. It happens in as many as one in three pregnancies, although the risk gradually decreases as pregnancy progresses. What causes miscarriage? How is it treated? And why is appropriate health care for miscarriage under scrutiny?

Mind and body are tightly connected. If a child experiences stomach pain lasting two months or more, it may be functional abdominal pain caused by stress, depression, or anxiety. While common, this is challenging to diagnose and treat.

Your doctor may ask you to track your blood pressure at home to help decide if you need to start taking medication or to track your response to treatment. Here's how to get accurate readings.

Lingering heat waves have brought warnings about recognizing and preventing heat-related illnesses. Heat rash, while not dangerous itself, can signal heat exposure that may lead to more serious conditions. Here's how to avoid and treat it.

News coverage of a case of leprosy in central Florida may have made it seem like there is an increased threat the disease would spread. Misconceptions about this disease have persisted for a long time, but the facts are reassuring.

Validation is a valuable communication technique that can help people feel heard and understood. When used correctly it helps us understand  another person's feelings and establishes trust, particularly in situations with heightened emotions.

While the FDA rules for blood donation were revised twice in the last decade, one group — men who have sex with men — continued to be turned away from donating. Now new, evidence-based FDA rules will focus on individual risk rather than groupwide restrictions.

In some men with localized prostate cancer, focal therapy is an alternative to radical prostatectomy. This procedure removes only the cancerous part of the gland, and growing evidence shows it can be an effective strategy.

Involuntary tics are very common, with as many as one in five children experiencing them at some point. They may be temporary or long-lasting. Tic disorders like Tourette syndrome usually are diagnosed during childhood, though sometimes this happens later.

Mounting evidence paints a worrisome picture of the potential health consequences of nontraditional shift work schedules. So how can people who are required to work during the night and sleep during the day protect their health and well-being?

Plyometric training involves short, intense bursts of activity that target fast-twitch muscle fibers in the lower body that generate power for increased speed and jumping height. Doing plyometric exercises can boost strength, power, and agility.

Not only is our face our calling card to the world, its features evolved to mount immune system defenses, help ward off illness, and protect us in many ways. Our eyes, nose, mouth, and facial structure itself all contribute to our continued well-being.

Beverages that promise similar energy perks and health benefits as coffee and tea are growing in popularity. Often marketed as wellness drinks, how do these alternatives stack up nutritionally?