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Atelectasis is the collapse of 1 or more sections (lobes) of the lungs. Here's what you need to know about this condition.

Multiple sclerosis (MS) is a disease of the brain and spinal cord. Unfortunately, there is no cure for MS. But there are many treatments, and many people with MS can manage their symptoms and lead active, healthy lives. Read on to learn more about MS and its treatments.

The brain is your body's control center. It manages everything from movement and balance to emotions and memory. When a seizure happens, some or all brain functions are temporarily affected.

A muscle spasm (also called a cramp) is an involuntary muscle contraction. The muscle tightens quickly and strongly.

A pilonidal cyst is found near the tailbone or top of the buttocks crease. It may look like a pit or small depression. In some cases, it may have a hollow tunnel (sinus tract) that connects it to the surface of the skin. This sheet tells you more about pilonidal cysts and how they're treated.

Severe nausea and vomiting that doesn't let up during pregnancy is not normal and can result in dehydration and weight loss. Learn about what you can do.

If you have a chronic lung disease, you may have trouble sleeping. Here are some tips to help you sleep better.

The earlier treatment for a stroke is started after symptoms begin, the more likely you are to survive and recover. Here is what you can expect during treatment.

Some cancer treatment medicines are given through an IV. Sometimes the medicine can leak out of the vein and into nearby tissue under the skin, causing a reaction at the injection site.