The Nazi leader lost a testicle during the Battle of the Somme in 1916, the doctor claimed.
The medical condition, for which there has never been conclusive proof, was mocked in the Second World War ditty which begins: “Hitler has only got one ball, the other is in the Albert Hall.”
The disclosure is made in a document noting a conversation in the 1960s between German war doctor Johan Jambor and his priest, Franciszek Pawlar, according to The Sun. The priest’s document has come to light 23 years after Jambor’s death.
Although it was known Hitler suffered a groin injury in the Somme, evidence that he was ‘monorchic’ – the medical word for the condition – has evaded historians.
Blassius Hanczuch, a friend of Jambor, said the doctor later blamed himself for saving Hitler’s life. He said: “In 1916 they had their hardest fight in the Battle of the Somme. For several hours, Johan and his friends picked up injured soldiers. He remembers Hitler. They called him the ‘Screamer’. He was very noisy. Hitler was screaming ‘help, help’.
“His abdomen and legs were all in blood. Hitler was injured in the abdomen and lost one testicle. His first question to the doctor was: ‘Will I be able to have children?’.”
The popular song emerged in 1939 and is thought to have been written by a publicist for the British Council, which was tasked with helping build propaganda that would damage the Nazis.
The commonly-recalled version is an adaptation of the original, which ran: “Göring has only got one ball, Hitler’s [are] so very small, Himmler’s so very similar, And Goebbels has no balls at all.”