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Raynaud’s phenomenon is when a child’s blood vessels react in an exaggerated way to cold or stress.

Red blood cell (RBC) disorders are conditions that affect red blood cells, the cells of blood that carry oxygen from the lungs to all parts of the body.

A child is in respiratory distress when he or she has difficulty breathing.

Respiratory syncytial virus (RSV) is a viral organism that can cause upper and lower respiratory tract infections.

Retinoblastoma is a rare childhood cancer of the eye. It arises from the retina.

Rectal prolapse occurs when the lining of a child's rectum protrudes through the anus and outside the body.

Radial longitudinal deficiency (radial club hand) is a rare condition that affects the forearm.

Reye syndrome is a rare condition that affects the normal chemical balance in the body, resulting in potential damage to all organs, but primarily the brain and liver.

Robin sequence (aka Pierre Robin sequence) is a combination of facial differences that are present at birth.

Rocky Mountain spotted fever (RMSF) is an infection caused by a type of bacteria carried by ticks.