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A food allergy is when your body has a bad immune reaction to a certain food. This is different than a food intolerance, which does not affect the immune system. Read on to learn more.

A food allergy is when your child’s body has a bad immune reaction to a certain food. Learn more about food allergies.

Cerebral venous sinus thrombosis (CVST) occurs when a blood clot forms in the brain's venous sinuses. The clot prevents blood from draining out of the brain. As a result, blood cells may break and leak blood into the brain tissues, forming a hemorrhage. This can occur in adults and in children.

You may need a blood transfusion if you have lost blood because of an injury or during surgery. You may also need one because of diseases or conditions that affect the blood. This sheet helps you understand how a blood transfusion is done.

Many people have changes in their sex life after cancer treatment. You may have both physical and emotional side effects.

CMV (cytomegalovirus) is a herpes virus. It is very common. It affects people of all ages and in all parts of the U.S. In most cases, CMV causes mild symptoms, or no symptoms at all. But it can cause serious problems in an unborn baby or newborn.

A blood transfusion is a procedure in which you receive blood or parts of blood through an I.V. (intravenous) line.

A chest X-ray is an imaging test that uses X-rays to look at the structures and organs in your chest. It can help your doctor see how well your lungs and heart are working.

This test looks for bacteria that cause chlamydia, the most common sexually transmitted infection in the U.S.