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A brain tumor starts when cells in the brain change and grow out of control. As they continue to grow, they form a mass of cells that becomes a tumor. Learn about the types of brain tumors and symptoms.

Opportunistic infections that other people might fight off easily could make you really sick if you have HIV. Getting one or more of these opportunistic infections could mean that your HIV has advanced to AIDS.

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).

Anorexia nervosa (or simply anorexia) is an eating disorder that causes people to obsess about their weight and food. People who suffer with this behavior problem have a distorted body image. They see themselves as overweight even when their weight is dangerously low.

Swallowing difficulties can happen for reasons ranging from dehydration to illness. Most cases are short-lived, but sometimes you might need medical treatment or special home care.

Getting enough folic acid can reduce the risk for neural tube defects (NTDs) and may also reduce the risk for other serious birth defects of the brain and spinal cord.

Magnetic resonance cholangiopancreatography (MRCP) is a special kind of MRI test. Your healthcare provider uses it to look at the pancreatic system. This includes the pancreas, the bile ducts, gallbladder, and liver. The procedure uses a combination of magnets, radio waves, and a computer to make detailed images. A contrast dye may be used for even better images.

A hiatal hernia repair is surgery for a hiatal hernia. A hiatal hernia is an abnormal bulging in your belly. Read on to learn more about this surgery.

A retrograde pyelogram is an imaging test that uses X-rays to look at your bladder, ureters, and kidneys. Read on for details about what to expect before, during, and after this test.