Prince Harry has inherited the royals’ baldness gene
There is a strong baldness gene which runs through the royal family.
From Prince Philip to Prince Charles and now to Prince William, you can see how the gene has been passed from grandfather, to father, to son.
And it appears that Prince Harry may also be going the same way.
Estimates suggest that more than 80% of cases of male pattern baldness are hereditary.
Recent pictures of the 29-year-old prince, who celebrates his 30th birthday in September, show he is in the early stages of male pattern baldness.
Harry is already starting to lose the hair around his crown - there is noticeable thinning.
Prince William started losing his hair in his early 20s and was noticeably bald by the time he was 25.
The process appears to have started a little later for his younger brother Harry.
Around a quarter of men start going bald before the age of 30, so this is hardly a big surprise especially when it runs in the family as it does for the Windsors.
If Harry's hair loss progresses in the normal way, I would expect him to have a significant bald patch around his crown by the time he is 40. It will be worse if it also spreads to his hairline as it has with his brother.
Hair loss can have a devastating impact on young men like Harry.
It can shatter their confidence and lead to significant loss of self esteem.
A strong family gene is the most significant factor in the onset of hair loss.
Both of Harry’s uncles, Princes Andrew and Edward, have significant hair loss, too.
And the gene is prominent on his mother's side, too - Princess Diana's father Earl Spencer was bald.
Male pattern baldness is both genetic, and associated with the male sex hormones called androgens. Androgens have many functions, one of which is to regulate hair growth.
Each strand of your hair grows out of a little hole in your skin called a follicle. Normally, an individual strand of hair grows for two to six years, goes through a resting stage for several months, falls out, and is replaced by a new hair strand. With male pattern baldness, the hair follicle becomes smaller. It grows shorter and finer strands, and eventually stops growing hair altogether.
The signs are not good for Harry.
His options in covering up his baldness are limited. It would be difficult for Prince William, for instance, to shave his head, which is what around quarter of men do to hide their baldness, according to a recent poll by my own Crown Clinic in Manchester. A royal with a crew cut just doesn’t seem right somehow.
Prince Harry - recently voted the World's Most Eligible Bachelor in a magazine poll - once joked that Prince William was "already bald aged 12."
Harry, who turns 30 on September 15, also made fun of Prince William's baldness when commenting about artist Nicky Phillips’ portrait of the princes three years ago.
He said: "I'm a little bit more ginger in there than I am in real life, I think," he said.
"And William has got given more hair."
Prince Harry was pictured showing the first signs of hair loss on a trip to Lesotho in Africa in February last year
He met children at a charity on the trip who were urged to teach the young royal the sign language for "ginger."
Harry quickly replied: "What about the word for bald!"
Hair loss before the age of 30 can shatter a man's confidence, particularly around the opposite sex.
It can be devastating for a lot of men but I am not sure that will be a problem for Harry.
He has is a very charismatic young man and has always attracted the attention of beautiful women.
The stigma around seeking treatment for hair loss had largely gone, thanks to high profile hair transplant patients like Wayne Rooney and James Nesbitt.
Wayne Rooney was brave to go public about his hair transplant and show that he was not embarrassed to seek help for his hair loss.
The stigma around seeking treatment has been removed. It would send out a great signal to other men if a royal would also seek treatment.