Learn about the brain, its parts, each part's functions, and how the brain is protected.

When you're pregnant and have an asthma flare-up, it affects both you and your baby. The baby gets oxygen from your blood to grow and develop normally. Severe asthma can cause problems getting oxygen to your baby.

Follow up with your healthcare provider as you are told. You will likely feel better in a week or 2. But a dry cough can linger beyond that time. Let your healthcare provider know if you still have symptoms (other than a dry cough) after 2 weeks.

Yellow fever vaccine can prevent yellow fever. Yellow fever is a serious disease caused by the yellow fever virus. There is no medicine to treat or cure yellow fever.

Typhoid fever can be a life-threatening disease. Typhoid vaccine can prevent typhoid fever.

When your estrogen level falls, you may have symptoms. You also may be at a greater risk for osteoporosis and heart disease. Your diet, family health history, lifestyle, and other factors affect your symptoms and risks.

Here is an explanation of how food moves through your body and what each part of your digestive tract does.

If you've had a kidney stone, you may worry that you'll have another. Removing or passing your stone doesn't prevent future stones. But with your health care provider's help you can reduce your risk of forming new stones.

Open surgery may be done before, after, or instead of other treatments. This is usually done if the stone is very large, if you have a serious infection, or the kidney has blockage even after waiting for a while.

Percutaneous nephrolithotomy may be done before, after, or instead of other treatments. If you need this procedure, your doctor will discuss its risks and possible complications.