Doctors are puzzled as they examine little Ricky, a frequent patient of the ER, with persistent vomiting and an odd rash around his mouth and chest. There's no explanation for why the young child wheezes, but his every breath is a painful struggle.
When Aaron's panic-stricken parents bring their son into the ER with seizures, doctors discover a strange mass inside the boy's brain. Fearful it's cancer, they prepare Aaron for a biopsy until a sharp-eyed radiologist identifies it as a pork tapeworm.
Arunas has lived his life in good health, but after turning 50 he suddenly experiences recurrent bouts of vomiting, heart palpitations, weakness, and malaise. After rigorous testing, doctors suspect he is mentally ill, but one last test says otherwise.
The pain in Alice's legs and back is unbearable. Doctors find nothing and suspect she's neurotic. When her son and neighbors begin to experience similar symptoms, the doctors are baffled. But the cause is not an epidemic, it's a vindictive boyfriend.
A single mother wakes up to find she can no longer walk, and baffled doctors go looking for the elusive disease they suspect is afflicting her central nervous system.
A military wife suffers a sudden paralysis in her leg that defies explanation. The military medical specialists that investigate the elusive cause discover it may have something to do with her husband's top-secret work.
A young woman goes to the ER with severe abdominal pains only to discover she has a rare and virulent type of cancer that gives her only ten years to live. However there is more to the mystery and doctors must find out what.
After starting a new life in a new apartment, the mother of a little girl notices her child is suffering from a burning rash. Soon doctors find the surprising cause of her illness is a simple case of carelessness.
An athletic swimmer gets attacks of near-paralytic exhaustion, after which his urine becomes strangely dark. When he suddenly has a heart attack one doctor suspects the problem is something far worse.
An otherwise healthy college student comes down with a purple rash that literally spreads before his eyes. As the student's health deteriorates, the doctor must find the cause of the rash before time runs out.
A small child is unable to sweat. Over the years the family realizes that this is but one symptom of a mysterious disorder that if left untreated, could put the child's life in jeopardy.
A strongly-built young man blows his nose, and his life is changed forever. He gets violently ill and passes out, but the doctors can't figure out what he has, and they must find a diagnosis before one more sneeze kills him!
A seemingly-healthy pastor experiences deep pains in his chest. After being treated for a possible cardiac arrest, his symptoms persist over the years until he feels as if he is having a heart attack every day.
A man's health deteriorates as he begins to experience unexplained symptoms where his wristwatches spontaneously break and he starts setting off metal detectors. Things get worse when the sickness begins to affect his son.