True or false: In most cases of scoliosis, doctors cannot determine the cause.

If you notice periods of depression that seem to accompany seasonal changes during the year, you may suffer from seasonal affective disorder (SAD).

As the blooms and blossoms of spring spill out across gardens and yards, pollens and mold spores are also on the move. For people with seasonal allergies, spring can be a time of sniffles and sneezes. Find out more about seasonal allergies by taking this quiz.

A seizure is an uncontrolled electrical discharge from brain cells that causes mental or physical symptoms. Epilepsy is a group of chronic conditions in which a person has unprovoked recurring seizures. Find out more about epilepsy and seizures by taking this quiz.

You don't have to be reminded about the aging process. It's inevitable. But just because you're over 50 doesn't mean you can't be fit. Learn more about senior fitness by taking this quiz.

Getting older can affect your oral health. Some health conditions can affect your mouth, making problems you already have worse. That’s why is especially important to get good dental care as an older adult.

Answer this one: Which is the most common bacterial STI?

The first sign of shingles is often burning or tingling pain, or sometimes numbness, in or under the skin. You may also feel ill with fever, chills, headache, or upset stomach.

A glenoid labral tear and a torn rotator cuff are just two common injuries that can happen with the shoulder. Can you think of others? Find out how much you know about shoulders by taking this quiz, based on information from the National Institute of Arthritis and Musculoskeletal and Skin Diseases.

Red blood cells are usually doughnut-shaped. In a person with sickle cell anemia, the red blood cells are shaped like a C--like a sickle.

When your sleep is upset throughout the night, you can be very sleepy during the day. Maybe you have sleep apnea.

A good night's sleep—everyone needs it, but not everyone gets it. We stay up late and get up early, and then wonder why we always feel tired. Why is sleep important? See how much you know about snoozing by taking this quiz.

Why is sleep important? See how much you know about snoozing by taking this quiz.

Smallpox was once found throughout the world, causing illness and death wherever it occurred.

The health consequences of using smokeless tobacco include increased heart rate, high blood pressure, irregular heartbeat, and mouth sores.

Do you know the health risks of smoking? Avoiding them can help you have a healthy pregnancy and baby.

They fascinate. They repel. Some pose a danger. Most are harmless. And whether they are seen as scary creatures or colorful curiosities, snakes play important environmental roles in the fragile ecosystems of the nation's wildlife areas.

Each year, thousands of skiers and snowboard enthusiasts are injured, some seriously. Learn more about snow sports injuries and how to prevent them by taking this quiz.

Back pain is one of the most common nerve-related illnesses in the United States. Keeping your spine in good health is one way to avoid back pain. Learn more about your spine and back pain by taking this quiz.

You have your kneepads and your helmet. Or your faceguard and your gloves. Before you walk onto the playing field, don’t forget to protect your eyes.