Doctors are baffled by a woman's mysterious respiratory problem. Featuring Cushing's syndrome, gout, carcinoid cancer.

A child with celiac disease is intolerant of gluten; a woman has her left frontal lobe removed to stop seizures; another woman suffers from fatigue and mood swings. Featuring celiac disease, mitral valve prolapse (MVP), epilepsy.

A child with Hurler's disease undergoes a stem-cell transplant procedure; a woman is diagnosed with myasthenia gravis; A father has seizures and fainting spells due to a heart arrhythmia. Featuring Hurler syndrome, myasthenia gravis, cardiac arrhythmia.

A young boy's body is not producing antibodies to fight infections; a cancerous tumor must be removed; a woman loses the ability to walk. Featuring common variable immunodeficiency (CVID), gastrointestinal stromal tumor (GIST), reflex sympathetic dystrophy (RSD).

A baby who cries and holds her cheek; a woman who gained 100 pounds in three months and developed severe acne; and an avid athlete struggling to catch his breath. Featuring trigeminal neuralgia, polycystic ovary syndrome and alpha-1 antitrypsin deficiency.

A 12-year-old girl experiences abdominal pains and severe headaches until she is diagnosed with a retroflexed odontoid and Chiari One malformation; a firefighter and paramedic is diagnosed with acquired immunodeficiency syndrome (AIDS).

A 5-year-old has a persistent fever and stomachache. A man crippled with a neck tilt. A woman falls ill after traveling abroad. Featuring Crohn's disease, cervical dystonia, brucellosis.