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Male Infertility What is male infertility? Infertility is a disease of the reproductive system. It makes a person unable to have children. It can affect a man, a woman, or both. Male infertility means that a man has a problem with his reproductive system. It means you can't start

X-Linked Agammaglobulinemia in Children What is X-linked agammaglobulinemia in children? X-linked agammaglobulinemia is a rare genetic disease. It causes a weakened immune system. It is also known as Bruton's agammaglobulinemia. X-linked means that the gene that causes this

Graves Disease in Children What is Graves disease in children? Graves disease is an autoimmune disease. The immune system normally protects the body from infection and disease with proteins called antibodies. But with an autoimmune disease, the antibodies attack the body's own

Cholesterol in the Blood Facts about cholesterol Cholesterol is a fat-like, waxy substance that can be found in all parts of your body. It helps your body make cell membranes, many hormones, and vitamin D. The cholesterol in your blood comes from 2 sources: the foods you eat and

Appendicitis What is appendicitis? Appendicitis is a medical emergency. It happens when your appendix becomes sore, swollen, and diseased. The appendix is a thin tube that is joined to the large intestine. It sits in the lower right part of your belly (abdomen). The appendix is a

Necrotizing Enterocolitis in the Newborn What is necrotizing enterocolitis in the newborn? Necrotizing enterocolitis (NEC) is a serious, life-threatening illness in newborns. It happens when tissue in the large intestine (colon) gets inflamed. This inflammation damages and kills

Claudication What is claudication? Claudication is pain in your thigh, calf, or buttocks that happens when you walk. It can make you limp. It may be a symptom of peripheral artery disease (PAD). This is when narrowed or blocked arteries reduce the blood flow to your legs. At

Bone Marrow Transplant for Children What is a bone marrow transplant for children? A bone marrow transplant (BMT) is a treatment for children with certain types of cancer or other diseases. The goal of BMT is to replace a child’s diseased bone marrow with healthy bone marrow

Anemia in Children What is anemia in children? Anemia is a common problem in children. About 20% of children in the U.S. will be diagnosed with anemia at some point. A child who has anemia doesn't have enough red blood cells or hemoglobin. Hemoglobin is a type of protein that

Cancer and Tobacco How are tobacco and cancer linked? Using tobacco makes it more likely that you will get cancer. This includes lung, mouth, throat, bladder, and other cancers. In fact, 1 out of 5 people with cancer in the U.S. got it from smoking. All tobacco products, such as