Singer Jessie J is 'not OK' after mystery surgery

Jessie J is simply "not OK" after undergoing surgery for an undisclosed illness.

The "Bang Bang" singer has shared a photo on Instagram, with candid details about her current state. She posted an image two days ago of an IV drip in her arm, writing, "I am not ok...I am in a lot of pain. But I'm working on it with doctors."

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I have seen a lot of "How are you today" comments... How am I.... *Looks up sighs and has to be honest* I am not ok... I am in a lot of pain. But I'm working on it with the doctors. 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. And PLEASE know all of your understanding, love and support helps me so much. (And the morphine ) (And my Mums hugs) How are you today? Love Jess x A photo posted by Jessie J (@isthatjessiej) on Jun 26, 2015 at 7:37pm PDT

Four days earlier, she posted a short Instagram video, showing her before and after surgery. "On fleek to on bleek real quick," the singer joked. Though she didn't share why she was undergoing surgery, she clarified that it had nothing to do with her "heart or voice."

"My heart and voice are fine," she writes.

On fleek to on bleek real quick | lol Before | After I'm going to be offline for a few days and I wanted to show you why | I don't often share personal stuff (especially about my health) anymore | I just get on with it secretly | but I wanted to share with you before someone else might and it gets twisted and exaggerated into something different or worse. Meh. Just know I am ok as I say in the video on the right | I had an operation yesterday so need to rest | I won't be saying what for so PLEASE don't keep asking me or harassing my close ones on here or anywhere for information | Its personal and I know you can respect that | I just wanted to explain to my fans why I may go AWOL for a minute | Love, prayers and well wishes is all I need Sleep | rest | maybe some pie and mash but mostly focusing my mind on getting my body better | and for the record it's not my heart or my voice | my heart and voice are FINE | I want to take a moment to send a virtual hug and kiss out to anyone in pain or suffering at the moment. In hospital or at home. There is always someone worse off than us and in moments like this I pray for you all | Hospitals have been my secret second home my whole life and they never get nice to be in | But they can inspire a great song | Trying to see the positive in everything ☺️ Night gown could be good for the Voice live shows look too right? No? Too Much? lol Peace out for a minute people As Arni said on Graham Norton last night | "I'll be back" A video posted by Jessie J (@isthatjessiej) on Jun 22, 2015 at 11:52pm PDT

The British performer has had to cancel a slew of performances in Denmark, Belgium and England. Back in March, she also canceled Australian tour dates "due to a sudden illness."

The singer is currently a judge on The Voice Australia.