Pop star Jessie J has more surgery: 'I'm not any better'

Jessie J shared this photo to her Instagram followers after undering surgery for a mystery condition. Photo/Instagram

British pop star and The Voice judge Jessie J has undergone a second round of surgery to treat her mystery condition.

The singer revealed last week that she was in hospital recovering from an operation, but would not reveal the nature of her surgery or illness.

She cancelled upcoming gigs in England, Belgium and Denmark as she took longer than expected to get better, and she has now undergone another procedure.

"Just had a second surgery ... I'm not any better but everyday working towards it ... I love and trust the people around me enough to face my fears of operations even if I need a little push sometimes," she writes on Instagram.

Jessie J, the newest mentor on The Voice Australia, still hasn't shared what is wrong with her but said she is happy to keep her fans updated on her wellbeing.

"I'm telling you how I am because some people ask ... And with me having to cancel some shows it's fair to those asking where I am that you know I'm in hospital and I haven't just disappeared... God bless you all sending love support prayers and well wishes."

Earlier this week, she worried her fans by telling them she is in "a lot of pain" and "not ok" after undergoing her first round of surgery.

The UK pop star posted a photo of her arm with a drip in it with a letter to fans that thanked them for their support but admitted: "I am not ok ... but I'm working on it with the doctors"

She wrote: "We all have our moments and one of mine is now. Being human sucks when you are non stop and your body says NOPE not right now. Unexpected but I'm here trying my best to not let it win. Sometimes admitting how you really feel can be the quickest road to recovery."

The Keep Us Together singer was admitted into hospital last week for the surgery for a health issue she has been dealing with "secretly".

Jessie posted a "before and after" video on her Instagram account showing her putting on hospital socks in a joke seductive manner and then lying in a hospital bed connected to a heart monitor as REM's Everybody Hurts plays in the background.

The accompanying post to fans revealed she needed to have the medical procedure and explained she will be "AWOL" from social media as she recovers.

The 27-year-old pop star - who has been on her Sweet Talker world tour - also assured her fans the operation was unrelated to Wolff-Parkinson-White syndrome, a heart condition that caused her to have a stroke at the age of 18.

- WENN