On average, how many hours do you sleep each night? For most healthy adults, guidelines suggest at least seven hours of slumber. But these are general recommendations and not strict rules. “Some people need less than seven hours, while others might need more,” says Eric Zhou with the Division of Sleep Medicine at Harvard Medical…

One of the many underappreciated things about the human body is that it has a lot of excess capacity. That is, our organs have more reserve than most of us will ever need. It’s as if our bodies were designed with the idea that we might need backups in case of illness or injury. And…

You may have heard recent news reports about a company that knowingly sold defective lead testing machines that tested tens of thousands of children between 2013 and 2017. Or wondered about lead in tap water after the widely reported problems with lead-contaminated water in Flint, Michigan. Reports like these are reminders that parents need to…

Headaches are very common in children and teens. In fact, more than half will suffer from headaches at some point, and by 18 years the majority of adolescents have had them. And while most headaches are part of a viral illness, some are migraines. In fact, recurring migraines affect as many as one in 10…

Here’s a question you may not have been asked lately: what do you know about lymph nodes? If your answer is “not much,” you’re not alone. But even as our lymph nodes maintain a low profile, they’re working around the clock to deal with potential health problems ranging from common viruses to deadly bacteria and…

Nearly a century ago, surgeons developed what is still considered the gold-standard treatment for benign prostatic hyperplasia (BPH), an age-related affliction that occurs when an enlarged prostate obstructs the flow of urine. Offered to men who don't respond to BPH medication, this procedure, called a transurethral resection of the prostate, or TURP, involves trimming excess…

First, some good news: Merkel cell cancer is exceptionally uncommon. Roughly 1,600 cases occur in the US annually. But this rare skin cancer sometimes goes unnoticed initially. That's worrisome because it often metastasizes early — that is, spreads to other parts of the body such as the lungs and bones. Here's what to know about…

Quelling the discomfort of atopic dermatitis, the most common form of eczema, can be a daily quest. This inflamed, itchy skin condition can interfere with sleeping, socializing, and many other activities. If home remedies such as gentle cleansing and regular moisturizing don’t provide relief, your doctor might recommend a prescription treatment to apply to your…

Loneliness is complicated. You can feel lonely when you lack friends and miss companionship, or when you’re surrounded by people — even friends and family. Either way, loneliness can have devastating health effects. It boosts risk for coronary artery disease, stroke, depression, high blood pressure, declining thinking skills, inability to perform daily living tasks, and…

A tremendous buzz surrounds collagen drinks and supplements, as celebrities and influencers tout miraculous benefits for skin, hair, and nails. Since the collagen in our bodies provides crucial support for these tissues, it seems plausible that consuming collagen might lead to lush locks and a youthful glow. But what does the science say? What is…