Doctors wonder why an apparently healthy baby fails to achieve its developmental goals; on the other hand, a woman who seemed to be in good health suddenly becomes ill.

A woman experiences chronic stomach pain and diarrhea attributed to irritable bowel syndrome; another faces extreme fatigue and night sweating while pregnant.

A baby boy could not keep any food down; an X-Ray revealed that he had been born with a diaphragmatic hernia. A woman who suffers from extreme fatigue has strange cravings for pickles; when her heart nearly stops, doctors try to find the cause of her problems.

An abnormality on the ultrasound alarms parents expecting a baby; a biology teacher has a series of strange symptoms.

An aspiring actress awakens to an excruciating pain on the right side of her face; Bill experiences nausea and strange tingling in his legs; doctor visits and MRI tests show how these two different cases reveal paralysis.