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Cancer Overview What is cancer? Cancer is an abnormal growth of cells. The whole body is made of cells that act and grow in controlled ways as the body needs them. Cells are controlled by genes. The genes in any cell in the body can be damaged. Then the cell can grow out of

Benign Skin Growths in Children What are benign skin growths? Children may have many types of skin growths. The vast majority of growths in children are benign. This means they are not cancer. Growths may be caused by genetics, injuries, sun exposure, or other reasons. What are

Knee Pain and Problems Brief anatomy of the knee The knee is a vulnerable joint. It bears a great deal of stress from everyday activities, such as lifting and kneeling, and from high-impact activities, such as jogging and aerobics. The knee is formed by these parts: Tibia. This

Allergens: Pollen What is pollen? Pollen is the tiny egg-shaped male cells of plants, including trees, grasses, and weeds. Pollen is microscopic in size. It is the most common cause of hay fever (seasonal allergic rhinitis). Which plants produce pollen that cause allergic

Nipple Problems and Discharge What are some common nipple problems? Nipple conditions are a common noncancer (benign) breast condition that affect many people assigned female at birth. Some problems are related to lactation. Others are not. Like all breast conditions, any nipple

Hepatoblastoma in Children What is hepatoblastoma in children? Hepatoblastoma is a very rare cancer that starts in the liver. It usually affects children younger than 3 years of age. About half of all children with it are diagnosed before age 1. It usually doesn't spread

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

Planning a Pregnancy If you're planning to become pregnant, taking certain steps can help reduce risks for both you and your baby. Good health before deciding to become pregnant is almost as important as a healthy lifestyle during pregnancy. The first few weeks of pregnancy are

Diaphragmatic Hernia in Children What is a diaphragmatic hernia in children? A diaphragmatic hernia is a birth defect that occurs in about 1 out of 2,500 newborns. It happens in a baby during pregnancy. In this condition, there's an opening in your baby's diaphragm. This is the

Benign Skin Growths What are benign skin growths? Skin changes as you grow older and are exposed to sunlight, health conditions, trauma, and other environmental changes. Most people have some skin marks, such as freckles and moles. They may multiply or darken over time. "Benign"