Your Body

Where's the Wisdom in Wisdom Teeth?

Often these teeth are troublemakers that decide to turn crooked, refuse to grow in completely, or become misshapen.

Preparing Your Daughter for Changes

A young girl's first period should not happen out of nowhere; it should never be a complete surprise.

Legs Aid Heart in Pumping Blood

Your heart pumps blood through 60,000 miles of vessels. But it gets help in this huge task from your body's other muscles, especially those in the legs.

All About Endocrine Hormones

Hormones, which are chemical signals, affect growth, metabolism, blood pressure and even behavior.

Boning Up on Marrow

Blood Vessels: Your Internal Superhighway

Every minute of every day, millions of blood cells trek through about 60,000 miles of blood vessels -- enough to stretch from New York City to San Francisco 23 times -- delivering oxygen and nutrients to every tissue. Your cardiovascular system includes your heart and two basic kinds of blood vessels: arteries and veins.

Voice Disorders

When the vocal cords don't vibrate normally, it can cause voice disorders such as problems with pitch, volume, tone.

Ear, Nose, and Throat Facts

The ear consists of three areas—the outer, middle, and inner ear. The nose is the organ of smell and is part of the peripheral nervous system. The throat is a ring-like muscular tube that acts as the passageway for air, food, and liquid.

What Is the Gallbladder?

The gallbladder is a four-inch, olive-shaped muscular sac that lies under the liver in the right side of the abdomen.

Don't Forget to Remember

Your memory is built in three basic steps. Before you can remember something, you have to learn it.

All About the Stomach

Your stomach's starring role is as an organ essential for digestion. The stomach breaks down all the food you eat.

How Your Lungs Work

Your lungs are remarkable organs with multiple roles. Each day, up to 2,300 gallons of air pass through your lungs.

What Are the Kidneys?

Why the Doctor Uses a Stethoscope

Your doctor's stethoscope is a simple device that gives him or her crucial information about your heart.

How the Nose Works

The nose on your face is just the tip of an iceberg. The important functions—breathing and smelling—actually happen mostly inside your head, in your nasal cavity.

A Quick Look at Reflexes

What happens when your health care provider taps on your knee with a rubber mallet? Your leg kicks forward, seemingly on its own. And in a sense, your leg has a mind of its own -- in your spine.

A Question of Taste--Or Is It Smell?

Our taste buds are important, but smell seems to play a bigger role. Most people who complain of loss of the sense of taste are surprised to learn they are actually having problems with their sense of smell.

Why the Doctor Examines the Neck and Throat

Your Pancreas

Pound for pound, your pancreas is one of the hardest-working organs you have. It's not very big -- about as long as your hand in an irregular tube shape. But your pancreas does two different yet equally important jobs.

Why the Doctor Looks at Your Fingernails

Did you know that at least 40 medical problems can be detected when your doctor examines your fingernails? Their color, shape and condition can tell your doctor a lot about your health.

What Is the Thyroid Gland?

The thyroid gland controls how fast your heart beats, how quickly you digest food, how much you sweat, the speed at which you burn calories, and many other activities.

Q and A: Blood Sugar

The purpose of blood sugar is to provide "food" for your body's cells. Glucose is the sugar that provides energy all cells in your body need.

Thirst and Dehydration

The average adult has 10 to 12 gallons of water in his or her body, accounting for 60 percent of body weight. That water plays a critical role in nearly every bodily process. And being a quart or two low can affect how you feel.

Exercise and Target Heart Rate

The key to cardiovascular fitness is getting a good but safe aerobic workout. Heart rate monitors, which monitor your heart rate while you exercise, can help you do that with ease.

Why the Doctor Takes a Blood Sample

You probably don't enjoy giving a blood sample, but it's an important part of a physical exam. From a small sample of your blood, your health care provider can order scores of tests.

Why Fat Cells Are Important

Fat cells store excess energy in the body. People who tend to become overweight aren't very good at burning up calories; instead they store them as fat.

Wanted: The Free Radical

Hearing Hazards in Everyday Life

It doesn't take a thunderous rock concert to cause hearing loss. Any repeated high-volume experiences or one-shot booms can damage the delicate nerve cells of your inner ear.

Andreas Vesalius, Father of Modern Anatomy

Vesalius revolutionized the science of anatomy by basing his findings on direct observation of the body itself, rather than on centuries-old received wisdom.

What Is the Sense of Taste?

Your sense of taste is brought to you by more than 10,000 little taste buds on your tongue that turn eating into a pleasurable experience.

How Your Lymph System Works

Lymph is a colorless, watery fluid that originates as blood plasma. It seeps from the small blood vessels, or capillaries, to bring nutrients to cells and transport waste from the cells.

The Skinny on Skin

The skin is your body's largest organ. It protects you against bacteria, viruses, dirt, wind, heat and cold. And it serves as a "window" to the body, alerting doctors when something is wrong.

This Doctor Solved the Riddle of Blood Circulation

In 1616, when William Harvey announced that the heart propels blood and that blood circulates throughout the body, his findings were revolutionary.

Why the Doctor Presses Your Abdomen

When your doctor presses on your abdomen, he or she is feeling to see if any major internal organs are enlarged or tender, making them painful to touch, which could indicate disease.

How to Prevent and Relieve Digestive Problems

Just as simple things can upset your digestive system, simple changes can help. The following tips can help prevent or relieve digestive ills.

Why You Need Water

About 80 percent of the water you take in comes from the water and other beverages you drink; the remaining 20 percent comes from food.

Artificial Teeth


Detailed information on the different types of scars, including keloid scars, hypertrophic scars, contractures, and adhesions

Five Myths About Water

The Many Causes of Insomnia

Anxiety and stress are the most common causes of insomnia. But sleeplessness can also be caused by a variety of medical conditions, medications and environmental factors.

Dry Mouth: It's a Warning Sign

A dry mouth may not sound like a health threat. But that parched feeling can cause tooth decay and gum trouble, as well as discomfort when eating or speaking.

Checking Your Own Blood Pressure

Did you know you can purchase your own blood pressure monitor and check the reading yourself at home?

Where's Your Body Fat?

It's important to note that it's not just how much extra body fat a person has, but where it is stored on the body that determines how risky the extra pounds are.

Give Bad Breath the Brush-Off

Although it's rarely a sign of a major medical problem, bad breath can cause embarrassment, low self-esteem and even social isolation.

The Power of Meditation

Meditation allows you to become more awake and more deliberate about your actions. It teaches you how to respond rather than react to situations in your life.

Appendicitis: Children and Teens

Appendicitis, an infection of the appendix, is the most common reason for a child to need emergency abdominal surgery.

Care of the Mouth and Teeth

Most children should begin regular dental care by the time they turn 1 year old.

Sweet Dreams as You Age

Older adults need about the same amount of sleep as younger adults: seven to nine hours per night, on average.

Practicing Better Posture

Good posture improves your appearance and reduces stress on muscles, joints and ligaments.

Basics About Your Newborn’s Body

Even the best-prepared parents may be surprised by a few things that are quite normal in newborns.

Male Menopause

Male menopause is a condition caused when testosterone levels decrease in aging men.

All About Melatonin

Melatonin is a hormone that regulates your circadian rhythm, or the 24-hour cycle of biological processes called your "internal body clock."

Keep Your Kidneys Working Well

Your kidneys are your body's filters. They remove waste and excess fluid from your blood.

Keeping Your Liver Healthy

The liver is a multitasking organ, with many functions. Nearly all the blood that leaves the stomach and intestines passes through the liver for processing.

The Lowdown on Low Blood Pressure

Doctors often consider chronically low blood pressure too low only if it drops suddenly or causes noticeable symptoms.

Contraception: Many Options

For a woman who wants to plan when she becomes pregnant, there are many choices.

What to Do About a Pain in the Neck

Most neck pain is caused by sleeping on a bed that’s too soft, poor posture, stress, neck strains or degenerative joint disease that occurs when the joints of the neck become inflamed or a disc pushes outward from its normal position.

Relaxation Techniques That Really Work

To keep stress at a minimum and reduce its effects on your life, you need to find and practice healthy ways to manage it.

Overview of Sleep Problems

Sleep is essential to physical and emotional health. Adequate sleep may also play a role in helping the body recover from illness and injury.

Essential Foot Care

Years of wear and tear can be hard on your feet, as can shoes that don’t fit properly. Injuries and disorders of the feet can affect your mobility.

Special Foot Care for Diabetes

It's not high blood sugar, heart disease, or stroke that most often puts people with diabetes in the hospital. It's their feet.

Alcohol and Older Adults

Many older adults enjoy a glass of wine with dinner or a beer while watching the game on TV. In fact, half of Americans ages 65 and older drink alcohol. Having a drink now and then is fine—as long as you don’t overdo it.

Coping with Miscarriage

A pregnancy ended by miscarriage can be a traumatic loss. Unfortunately, it’s one that many women experience. Knowing how to deal with your feelings and find support can help you cope during this difficult time.

Introduction to Menopause

When a woman permanently stops having menstrual periods, she has reached the stage of life called menopause. This stage signals the end of a woman's ability to have children.

Using a Surgeon's Tools to Erase the Years

It's called plastic surgery, but there's no plastic involved. In this case, "plastic" refers to the ability of the surgeon to reshape the skin, the face, or other body parts. With advances in technique and an aging population, plastic surgery is more popular than ever.

As You Age, Be Aware of B12 Deficiency

Getting too little vitamin B12 may leave you feeling fuzzy in your thinking and lead to numbness or tingling in your hands and feet.

Dental Implants

Detailed information on dental implants, including types and potential risks

How to Tell if Your Child Needs Braces

Orthodontic treatment most commonly begins between ages 9 and 14 because kids in this age range have at least some permanent teeth and are still growing.

Pregnancy: What’s Normal … and What's Not

Some pregnancy changes are caused by hormones. Others are caused by the pressure and weigh of your growing baby.

Say Goodbye to Dry Skin

What can you do to avoid scratching and flaking your way through the winter months? Here are some tips to try.

Don't Take Your Eyes for Granted

The number of people losing their vision is growing, yet experts say much of this vision loss could be prevented.

Your Immune System's Constant Battle

Your immune system carries on daily battles with invaders without your knowledge.

How Safe Are Cosmetics and Personal Care Products?

Overall, cosmetics and personal care items are considered safe. But that doesn't mean that there aren't risks associated with their use, particularly if you don't use them correctly.

Lymphedema After Breast Cancer

After you have been successfully treated for breast cancer, you face another potential problem—lymphyphedema, a swelling that occurs in the arm, breast, or chest area after breast cancer treatment.

Living Well to Reach Age 100

Healthy lifestyle choices can help you enjoy a better quality of life for an increasing number of years. The best news is that it’s never too late to get started.

Debunking 10 Aging Myths

Many older Americans lead healthy, interesting, and productive lives well into their later years. But that’s not what we usually hear about.

Exercise Ideas for Older Adults

Finding ways to get exercise as you get older is a smart and easy way to stay fit and improve your health.

Good Night, Sleep Tight

Insomnia, trouble falling asleep or trouble sleeping, is a growing problem in the United States.

Eye Quiz

Don't sit too close to the TV. Don't watch TV without a light on in the room. Don't use over-the-counter eyedrops. Are these statements true? Find out by taking the following quiz.

Blood Transfusion Quiz

Every year, millions of Americans roll up their sleeves to donate blood, helping accident victims, surgical patient and others in need. How much do you know about blood transfusions? Take this multiple-choice test and find out.

Discovering Diabetic Autonomic Neuropathy

Diabetic autonomic neuropathy usually occurs after a person has had diabetes for at least 20 years or has had poor control of blood sugar.

Five Steps to Better Memory

Aging can make it harder to remember some things. But by focusing on your potential and continuing to exercise your mind, you may be able to boost your memory power. Here are some strategies.

Dress for Success--and Your Health

For women, ill-fitting, irritating, or otherwise inappropriate clothing and accessories could contribute to health issues ranging from back pain to crooked toes to eye infections.

Why Do We Sneeze?

Achoo! Did you know that a sneeze is one of the body's natural defenses? It helps get rid of foreign invaders that sneak into your nose and threaten your lungs and other body parts.

Help for Hair Loss

When hair loss becomes excessive, resulting in thinning hair or bald patches on the scalp, factors other than the natural cycle of hair growth and loss are responsible.