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Varicose Veins What are varicose veins? Varicose veins are enlarged, twisted veins. They can happen anywhere in the body. But they are more common in the legs. Varicose veins are not considered a serious health problem. But they can be uncomfortable and can lead to more serious

Bacterial Endocarditis in Children What is bacterial endocarditis in children? Bacterial endocarditis is an infection of the inner lining of the heart (endocardium), or the heart valves. It doesn't occur in children very often. But when it does, it can cause serious heart damage

Mood Disorders in Teens What are mood disorders in teens? Mood disorders are a group of mental health problems. They are sometimes called affective disorders. These are the most common types: Major depression. A teen with this type has a depressed or irritable mood, along with

Fever in Children What is a fever? Most doctors define a fever as a temperature of 100.4°F (38°C) or higher when taken rectally or 100°F (37.8°C) or higher when taken by mouth. You might get slightly different numbers depending on how you take your child's temperature. The body

Allergy Overview What are allergies? Allergies are due to a problem with the body's immune system. Most allergic reactions happen when the immune system reacts to a false alarm. Normally the immune system attacks harmful things, such as viruses or bacteria. But sometimes it

Food Allergies in Children What is food allergy in children? A food allergy is when your child’s body has a bad immune reaction to a certain food. This is different from a food intolerance, which does not affect the immune system. This is true even though some of the same signs

Lymphadenopathy in Children What is lymphadenopathy in children? Lymphadenopathy means swelling of the lymph nodes or glands. These are the bean-shaped glands in the neck, armpits, groin, chest, and abdomen. These glands act as filters for lymphatic fluid. This fluid contains

Breast Cancer: Surgery Surgery is a common treatment for breast cancer. It’s done to remove as much of the cancer as possible. You have many surgical choices. The type of surgery you need depends on: The size of the breast lump or tumor and where it is in your breast. The type of

Polycystic Ovary Syndrome (PCOS) What is polycystic ovary syndrome (PCOS)? Polycystic ovary syndrome (PCOS) is a set of symptoms caused by a problem with a woman’s hormones. It affects the ovaries. These are the small organs that store a woman’s eggs. But it can also affect the

COVID-19 What is COVID-19? COVID-19 is an infectious disease that most often causes a respiratory illness. You may hear it called COVID or coronavirus disease 2019. It's caused by a virus called SARS-CoV-2. There are many types of coronaviruses. They are a common cause of