Medical

Periodontitis Definition Periodontitis is a serious gum infection that damages the soft tissue and bone that supports the tooth. The word “periodontitis” literally means “inflammation…

Autoimmune Hepatitis Definition Autoimmune hepatitis (AIH) is a chronic condition and can result in cirrhosis (scarring) of the liver and (ultimately) liver failure. AIH is…

About Lyme Disease Definition Lyme disease is a disease caused by the bacterial spirochete Borrelia burgdorferi, transmitted by deer ticks and characterized initially by a…

Autoimmune Disease Definition Autoimmune disease is a disease in which impaired function and the destruction of tissue are caused by an immune reaction in which…

Concussion Definition Concussion is an injury to a soft structure, especially the brain, produced by a violent blow or impact and followed by a temporary,…

Encephalitis Definition Encephalitis is an inflammation of the brain tissue. It is different from meningitis, which is defined as inflammation of the layers of tissue,…

Rett Syndrome Definition Rett syndrome (RTT) is a rare, severe neurological disorder that affects mostly girls. Girls with the syndrome show normal development during the…

Hematuria Definition Hematuria is a condition where there is blood in the urine. If this happens, it may be nothing to worry about or it…

Costello Syndrome Definition Costello syndrome is a disorder that affects many parts of the body. Its condition is characterized by delayed development and intellectual disability,…

Achondroplasia Definition Achondroplasia is a skeletal disorder, characterized by failure of normal conversion of cartilage into bone that begins during fetal life and results in…

Central Core Disease Definition Central core disease (CCD) is a disorder that affects muscles used for movement (skeletal muscles). It is also known as central…

Canavan Disease Definition Canavan disease is a rare inherited disorder that damages the ability of nerve cells (neurons) in the brain to send and receive…