A woman's leg swells to four times the size of her other leg. A boy living in pain due to his tightened muscles. Can doctors separate a baby boy from his parasitic twin? Two brothers avoid the sunlight.

The UK's shortest married couple both have dwarfism and are expecting their second child. In India, Miria is three and has a severe cleft palate.

Fatima is allergic to light and even indoors must take precautions to avoid succumbing to skin cancer. Amar's face has been destroyed by a bony tumour.

A girl's rare disorder causes her eyes to fall out of her head; a man who grows branches from his hands and feet hopes to return home; a baby with a large face tumor.

Kenyan orphan Forence Owitni, 28, suffered a growth on his genitals that has swollen his testicles and penis to the size of bagpipes. Can doctors successfully operate on him?

A woman embraces a condition that causes her to grow facial hair and a Nepalese man born with three legs gets a life-changing operation.

Rebecca vomits up to 12 times an hour and is often hospitalised. Jacque has a lymphatic malformation in her face that means she has never talked.

A girl lives with ants in her head; a man undergoes surgery to remove his 132-lb tumor; a woman with a large facial tumor contemplates a life-changing surgery.

A woman who slept through the birth of her child, hopes to find a diagnosis for her sleeping condition; a man with giant genitals seeks help; a 2.5ft teenager hopes to find out what stalled his growth.

A man seeks to repair his face after being mauled by a tiger; an 11-year-old undergoes fire treatment to lose weight; a boy living with tissue paper skin; a man with a hole in his face search for cures; a model embraces her hairy birthmarks.

Claimed to be the world's smallest teenage brothers, Jobdan and Yuki Lizarme from Peru are the size of pre-schoolers, but are young men, aged 18 and 16. What stopped them growing?

A look at how Sandra dos Santos, 50, from Rio, Brazil, lives the Rio beach lifestyle, despite the thousands of tiny tumours that bubble her skin - for which there is no cure.

17-year old Moroccan teenager Zoubair lives with extreme facial tumours that cause difficulties with breathing. Doctors must perform complex, yet life-changing surgeries.

Hashmot Ali was fishing to feed his growing family in Bangladesh when a tiger attacked him, tearing his face away. Now, 20 years on, he seeks an operation to restore his features.

Meet the man who suffers from a devastatingly disfiguring disorder, in which his body is covered in benign tumours. Plus, follow more incredible human stories.

A Brazilian village fears the sun, a South African woman has giant legs, there's an armless American mother and a girl's tongue won't stop growing.

A Polish woman undergoes a face transplant. A boy in China has a giraffe neck. A young Filipino girl has a sealed mouth.

In Peru, diver Alejandro's body has blown up like a balloon. Marc from Germany has to drink 20 litres of water every day or risks death.

Hear the inspiring story of Lalit Ram, who has learned to live with a large benign tumour that has disfigured his face. Plus, follow more incredible human stories.

A Puerto Rican boy’s face is melting away. In Afghanistan, doctors operate on a baby born with a parasitic tumour. A Brazilian girl’s feet won’t stop growing. In Sweden, a village can’t feel pain, and the man who lost his face to cancer finds a new look.

Hear the inspiring story of the world’s thinnest woman, Lizzie Velasquez, who has a disorder that stops her body from storing fat. Plus, follow more incredible human stories.

Meet the 17-year-old girl who has learned to live with a very rare condition: a parasitic twin, and follow her journey to remove it. Plus, follow the story of Indonesia’s tree-man.

Meet Bobby Jo and two of her children who were all born suffering from Crouzon syndrome, and learn how they have come to terms with it. Plus, follow more incredible human stories.

Meet Delfina and hear her story, which involves a bizarre condition where she unexpectedly cries tears of blood. Plus, follow more incredible human stories.

Meet a teen who has aged prematurely, a schoolteacher who cries crystals, a mother with very brittle bones, and a boy with butterfly skin.

Meet a Frenchman with a rare shaking condition, and an American woman with an enormous stomach tumour, and the wibbly wobbly man.

Chinese woman battles an aging condition, three Filipino brothers can never grow, Brazil has an all-dwarf soccer team, and a teen has half a body.

12-year-old Shreya Darji from India suffers an infestation where over a thousand ants were removed from her ears, with ten emerging every day. What causes this nightmarish problem?