Real-life werewolves, hearts in the wrong places and turning into stone - all of these surely seem like lost myths from old times. Or maybe people were just misunderstood? Here are 5 weird medical conditions you didn't know existed.

Where's my other Kidney?
1 in every 1000 people is born with only one kidney. Luckily, that kidney usually just works harder so sometimes the person doesn’t realise for years and years!

Mirror Image
Situs Invertus is a rare genetic condition where you are born with all your organs flipped like a mirror image. That means they can feel their heart beat on the right side of their chest, not the left.

Fishy Odours? No sweat. 
Trimethylaminuria is a rare genetic condition where the person is missing a special molecule that lives in most people’s guts which we need to help us break down some types of food. And if that food can’t be digested then it starts to build up and up, until the person starts to sweat it out – making the person smell really badly! It is also known as ‘fish odour syndrome’ as people say the smell is so gross it smells like old fish!

Werewolf? Just a really hairy dude.
Hypertrichosis, also known as werewolf syndrome, is where someone is born with hair everywhere – not just on their heads! Thick, dark hair covers the person's face and body so they used to get mistaken for werewolves.

Solid as a rock.
Stone man syndrome is another very rare genetic disease where as the person gets older, their muscles and joints slowly turn to bone – in some cases forming a whole second skeleton!