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According to historians, Adolf Hitler suffered from a humiliating condition which could explain his trademark rage and lack of sex life.

As reported by Daily Star Online, medical records following his arrest in 1923 suggests the war-monger suffered from "right-side cryptorchidism", the medical name for an undescended testicle.

But further medical records suggests the dictator manhood may have been more mutant than first thought.

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Records show the fascist fanatic had a related condition called Hypospadias – which can leave a man with a "micro-penis".

Worse still, the sufferer may have to wee out of a hole at the base or shaft rather than a tip.

In the new book Hitler's Last Day: Minute by Minute, historians Jonathan Mayo and Emma Craigie state the German leader harboured a dark secret.

They write: "Hitler himself is believed to have had two forms of genital abnormality: an undescended testicle and a rare condition called penile hypospadius in which the urethra opens on the under side of the penis."

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The Nazi tyrant was also well known to have a fear of even going half-naked around people and he never fathered a child – despite ranting on to Germans to spawn more Aryan babies.

The latest revelations could some way to explain why the leader was so full of rage.

And also why he demanded that everyone gave him that peculiar phallic salute.

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His personal doctor Theodor Morell used to give Hitler hormones, amphetamines and sometimes cocaine to try to boost the Fuhrer's puny sex drive so he could romp with his partner Eva Braun.

Dr Morell, a qualified urologist, is also said to have recorded the penis deformity.

As the Russians closed in on his bunker in Berlin in Spring 1945, those still in the underground lair witnessed Hitler's intense anxiety that his body would be captured and put on display in Moscow.

It is thought he either killed himself with cyanide provided by Dr Morell – or fled to South America via the Canary Islands.

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People who knew Hitler also noticed he was not into sex with his mistress, Eva Braun.

Nazi architect, Albert Speer, who was tasked with designing his leader massive buildings, said after the war that it was very noticeable.

He said: "By no means would I describe Adolf Hitler as sexually normal in his relationships with women.

"In the case of Eva Braun in particular, it seems clear to me that aside from occasional passionate episodes there was no sexual activity at all for long periods of time."

Myths surrounding Hitler’s testicles suggest that during the Battle of the Somme in World War 1, a flying piece of red hot shrapnel sliced his genitals.

And then there is the legendary playground ditty was written for the British council in 1939 to cheer the nation up in its darkest hour.

The lyrics were penned to the tune of the Colonel Bogey March and said: "Hitler has only got one ball, Goring has two but very small, Himmler as something similar but poor old Goebbels has no balls at all."

But despite his small penis and sexual ability, Hitler was a big hit with the ladies.

A special department was set up to deal with smutty fan mail sent by female fans who found him arousing.

It has also been revealed that Hitler used drugs such as cocaine.