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Anatomy and Function of the Heart Valves What are heart valves? The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood

Oppositional Defiant Disorder (ODD) in Children What is oppositional defiant disorder (ODD) in children? Oppositional defiant disorder (ODD) is a type of behavior disorder. It's mostly diagnosed in childhood. Children with ODD show a pattern of uncooperative, defiant, and hostile

Posttraumatic Stress Disorder (PTSD) in Children What is posttraumatic stress disorder (PTSD) in children? Posttraumatic stress disorder (PTSD) is a mental health problem. It can affect people of all ages. A child with PTSD keeps having scary thoughts and memories of a past event

Tourette Disorder in Children What is Tourette disorder in children? Tourette disorder (TD) is a neurological disorder. It is also called Tourette syndrome. The disorder causes repeated tics. Tics are sudden, uncontrolled vocal sounds or muscle jerks. Symptoms of TD often start

Common Cold in Children What is the common cold in children? The common cold (upper respiratory infection) is one of the most common illnesses in children. Each year it leads to more healthcare provider visits and missed days from school and work than any other illness. Millions

Headaches in Children What is a headache in children? A headache is pain or discomfort in one or more areas of the head or face. Headaches can happen once in a while. Or they may happen often. Headaches are often divided into two groups, based on what causes them: Primary

Vesicoureteral Reflux (VUR) in Children What is vesicoureteral reflux in children? Vesicoureteral reflux (VUR) is a condition where urine in the bladder flows in the wrong direction. It goes up into the tubes (ureters) that lead to the kidneys. It often flows all the way back up

Diaphragmatic Hernia in Children What are diaphragmatic hernias in children? A diaphragmatic hernia is a birth defect that occurs in about 1 in 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

Retinopathy of Prematurity What is retinopathy of prematurity? Retinopathy of prematurity is an eye problem that can happen to premature babies. The retina lines the back of the eye. It receives light as it comes through the pupil. From there, the optic nerve sends signals to the

Spina Bifida in Children What is spina bifida in children? Spina bifida is a condition present at birth (birth defect) when there are problems with the spine, spinal cord, and the surrounding nerves. It can cause part of the spinal cord and areas around it to form outside of the