THE Duke of Cambridge revealed the death of his mother Diana still haunts him as the “raw emotion is still brewing” inside him.
Prince William candidly spoke about his mother saying there was no “pain like no other pain”.
The 36-year-old opened up in the upcoming BBC One documentary: A Royal Team Talk about losing his mum and how it helped him related to other who had suffered a death.
He said: "I've thought about this a lot, and I'm trying to understand why I feel like I do, but I think when you are bereaved at a very young age, any time really, but particularly at a young age, I can resonate closely to that, you feel pain like no other pain.
"And you know that in your life it's going to be very difficult to come across something that's going to be even worse pain than that.
"But it also brings you so close to all those other people out there who have been bereaved."
In the programme he teamed up with Peter Crouch, Thierry Henry, Danny Rose, Jermaine Jenas and England manager Gareth Southgate as they shared issues they have struggled with in their careers in a discussion about the importance of mental fitness.
The conversation was filmed at the grounds of Cambridge United Football Club, which is aiming to set the example of being a mentally healthy football club.
'IT LEAVES YOU DEPRESSED'
Prince William also said being an East Anglian pilot was “very difficult” before of the emotional side to it.
He said he had seen men struggle to deal with their experiences of serving in Iraq and Afghanistan.
William added: "To then go in to the ambulance world, which is a much more open and actually, in some cases, very raw, emotional day-to-day stuff, where you're dealing with families who are having the worst news they could ever possibly have on a day-to-day basis, it leaves you with a very depressing, very negative feeling, where you think death is just around the door everywhere I go.
"And that's quite a burden to carry and feel.
"And I felt that with a few jobs that I did, where there were particular personal resonations with the families that I was dealing with.
"That raw emotion, I just thought listen, I can't – I could feel it brewing up inside me and I could feel it was going to take its toll and be a real problem. I had to speak about it."
Brothers William and Harry have both spoken openly about how they dealt with their mother’s death.
They started a mental health campaign called Heads Together that encourage people to talk about their problems.
Prince William acknowledged the culture of always having “British stiff upper lip”.
He said: "The British stiff upper lip thing, that's great and we need to have that occasionally when times are really hard. There has to be a moment for that.
"But otherwise we've got to relax a little bit and be able to talk about our emotions because we're not robots."
- A Royal Team Talk: Tackling Mental Health will air on BBC One on Sunday at 10.30pm