After years of severe stomach pains and other painful symptoms, Jackie discovers she's been suffering from Schistosomiasis, or snail fever.

Only 20 percent of infected individuals will show symptoms of Zika, making it often misdiagnosed. To make matters worse, it can result in devastating birth defects if a woman catches before or during pregnancy.

Charlye Hebert has been experiencing nausea, vomiting and diarrhea for months. Despite an initial diagnosis and treatment for stomach ulcers, her symptoms have yet to subside.

Doctors and family are stunned when they discover the cause of Kennedy's poor health is due to an extreme allergy to nickel, which can be traced to the metal braces on her teeth.

Xander's condition takes a devastating turn when his skin starts peeling off his body.

Now that doctors know what's wrong with Xander, they put him on life support to give him the best chance of recovery.

After spending two months in a coma as a result of a Group A Streptococcus infection, Katy wakes up to the devastating news that all four limbs had to be amputated in order to keep her alive.

After complaining about pain on his head, 8-year-old Andrew is rushed to the ER, where doctors remove a botfly larva from his scalp.

When doctors cannot find anything in his mouth, biology professor John Allen takes matters into his own hands and extracts a rare parasite called Gongylonema pulchrum.

After suffering from an array of symptoms for months, Al Ceccarelli is diagnosed with Strongyloides, a disease caused by parasitic worms found in tropical climates.

As soon as doctors make an incision near Paul’s eye, out pops a larva.

An ovarian teratoma removed from Kira’s body featured hair, teeth, tissue and other cells, resulting in her erratic behavior and sickness.

Sam's worsening flu-like symptoms takes him to the emergency room, where his urine indicates something dangerously wrong with his renal system.

With Brianna's head abrasion getting worse, her parents rush her to the ER where a dermatologist hears something terrifying coming from her scalp.

When a high school football star begins to experience odd symptoms, his parents take him to the hospital.

Stephanie noticed her 4-year-old son, Alex, came home with less energy than usual. But what seemed like the result of a long day at school quickly turned into a race to the emergency room.

When an Iraq war veteran comes home, he is surprised but pleased to see he is losing weight. Nothing could prepare him for the shock of pulling a foot-long tapeworm out of his rectum!

After spending a few days at a hospital, a man discovers an unsettling rash on his skin. As the days pass the rash begins to cover the majority of his body... doctors race to find out the cause before it's too late!

Malaria is the deadliest parasitic disease on the planet, causing nearly a million deaths a year.

An elite athlete begins to rapidly lose weight when doctors discover his spleen has grown to five times the normal size. It's a race against time before his spleen ruptures!

Found in contaminated food and water, Entamoeba histolytica is a parasite that feeds on living cells in the human gut.

After eating some raw sushi, a woman begins a fight for her life as a mass containing parasitic worms creates a blockage in her colon. The woman has Anisakiasis, a disease caused by Anisakis worms.

Unclean sheets and linens carry human scabies mites, which feed on human skin, causing intense itching. The condition is called scabies, or simply "the itch."

While swimming with a friend a man has a seizure and collapses. Shortly after, he finds out that a pork tapeworm has been slowly eating away at his brain!

Burrowing through the skin and internal organs, gnathostoma worms can eventually cause paralysis and death.

The Leishmania parsite feeds directly on the vital organs from the inside-out. It's spread through infected sand flies.

The pork tapeworm is a particularly vicious parasite because it can end up in the most important organ in the human body: the brain.

Armed with jagged teeth used to hook onto its host, the hookworm can be transmitted from your household cat onto a human.

Even dead, the larvae of parasitic roundworms can cause river blindness, or Onchocerciasis. These parasites are transmitted through the saliva of blackflies.

Acanthamoeba is a voracious parasite that enters the body through the skin or the nose, then devours brain cells.

Found inside undercooked wild game and pork, Trichanella spiralis is a parasitic worm that can cut through human muscles and tissue.

What happens when humans fall prey to parasites? Explore the shocking, gruesome and sometimes deadly details of parasitic infection on Monsters Inside Me. Returns Friday, Oct. 5 at 8PM E/P!