Open neural tube defects (ONTDs) are problems with the way the brain, spinal cord, or spine forms while a baby is growing in the mother's uterus.

Hemoglobin C disease is caused by abnormal hemoglobin, which is the part of red blood cells that carries oxygen to cells, tissues, and organs. Learn more about the condition, including causes, symptoms, and treatment.

A varicocele is when veins in the scrotum have become large and swollen (dilated). The condition is like varicose veins that occur in the legs. Here's what you need to know.

Walking pneumonia is a mild form of pneumonia. Children with walking pneumonia may feel very tired and run down. But they may still be able to do many of their normal daily activities.

Campylobacter infection is a mild to serious digestive illness. It is caused by bacteria. Symptoms often include cramping, diarrhea, belly pain, and fever.

MRSA is an infection that can be life-threatening if it spreads from the skin to the lungs, the bloodstream, or other organs. MRSA infection can be hard to treat.

Dyskeratosis congenita is a rare disease that's present at birth. Learn more about the causes, symptoms, diagnosis, treatment, and complications.

Blood-clotting disorders are a group of conditions in which there is too much clotting. They are often inherited.

White blood cells, red blood cells, and platelets are essential to body function, but plasma also plays a crucial, and mostly unrecognized, job. It carries these blood components throughout the body as the fluid in which they travel.

Think of white blood cells as your immunity cells. In a sense, they are continually at war. They flow through your bloodstream to battle viruses, bacteria, and other foreign invaders that threaten your health.