The former I'm A Celebrity contestant revealed he suffered a concussion, two broken ribs and punctured his spleen due to the nasty incident which has seen him "chilling" in intensive care in Andorra.
His mum, Vicky, is believed to have rushed to his hospital bedside following the reported smash at ski resort El Pas de la Casa.
Using his Instagram account, she updated fans to let them know Myles had an accumulation of blood within his pleural cavity.
Symptoms of the condition can include chest pain and difficulties with breathing.
Myles has a bit of a setback today.
Vicky wrote in his Insta Stories: "Myles has a bit of a setback today. He has a hemothorax and needed a chest drain.
"He is still thinking of you all and still getting grumpy with his mummy."
A social media post read: "Life is so precious, people! Cherish every single piece of it!
"A few days ago I had a bad boarding accident. I have concussion, two broken ribs and a punctured spleen which resulted in internal bleeding!
"I have seen progression in good health and thank God I am doing okay! Thank you to the nurses, doctors and especially my family for treating my like a prince! I love you all."
In a separate post, Myles kept his spirits up as he noted he had learned some important 'lessons' from his ordeal.
He said: "Lessons learned from this accident is! Mum is always right and never try [to] fight that! Lol.
"That my brothers love me. Step dad's still a [expletive]."
On Twitter, Myles told his followers he's "on the mend slowly but surely".
And when thanking fans for their messages of support, Myles joked he was not looking his best.
He said: "Look a bit worse for wear, don't I? Thank you for all your messages and my mum and the rest of my family are getting me through this.
"I'm just chilling in ICU [intensive care unit], it's like a five star ICU. I'm just counting my blessings day in day out.
"Always tell your loved ones you love them. Peace."
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