Harry's body starts to undergo a mysterious transformation. Sadie finds herself on the brink of starvation after her doctor dismisses her complaints.

A man tries to ease his wife's sinus pains, while a woman faces her own mortality when she experiences a series of debilitating symptoms.

A young man has strange growths; toddler rapidly gains weight.

A woman starts growing uncontrollably. A boy coughs up raspberry-like growths.

When Kylie is born struggling to breathe, doctors aren't sure whether they will find a cure. Also, athlete Michael is left fighting for his life when a sore throat turns deadly.

Since birth, Ricky is plagued by respiratory infections and a bizarre inability to grow. Noel is a healthy, active man until mysterious spasms start taking over his life.

A 14-year-old develops a rash that leaves her fighting for her life; a young father's body begins to shut down.

A girl is born with shocking deformities; a college student suffers from fluid around his heart and lungs.

A viral infection paralyzes Tammy from the chest down. Nadine's world is disappearing before her eyes as an unknown condition slowly steals her eyesight.

Weak muscles make walking and using hands difficult; bump on the finger could be the first sign of a deadly infection.