Alzheimer disease most commonly affects older adults. But it can also affect people in their 30s or 40s. When Alzheimer disease occurs in someone younger than age 65, it is known as early-onset (or younger-onset) Alzheimer disease.

Alzheimer disease is a progressive condition, which means that it keeps getting worse. Eventually, people with Alzheimer disease need help with daily activities because they lose the ability to dress, bathe, and feed themselves.

Today's society is increasingly mobile, and the demands of career and family often require travel during a woman's pregnancy. Here are some tips and guidance for safe travels while you're pregnant.

Color blindness is when you can't see colors in a normal way. It does not mean you can't see any colors at all.

Exercise-related heat exhaustion is an illness caused by getting too hot when you exercise. During heat exhaustion, your body temperature rises above normal.

A cardiologist is a healthcare provider who has had extra training to treat problems of the heart and blood vessels. These include heart attack and heart failure.

A person with fluency disorder has trouble speaking in a fluid or flowing way. They may repeat parts of words (stutter) or speak fast and jam words together (clutter).

When you have heart block, there is interference with the electrical signals that usually move from the top chambers of your heart to the bottom chambers, telling your heart when to beat. Read on to learn about causes, symptoms, and treatment.

Long QT syndrome can cause life-threatening rapid heart rhythms that can lead to fainting or sudden death.

Ventricular tachycardia is a fast, abnormal heart rate that starts in the lower chambers of the heart. It can become life-threatening if it lasts more than a few seconds. Here's what you need to know about this condition.