Jessie J has posted a heartbreaking update on her health in a new Instagram post.

The 33-year-old musician took to her Instagram stories on Thursday, August 12, to speak about her life living with Ménière’s disease - a rare illness that can cause vertigo, tinnitus, and hearing loss.

Posting a video of herself performing, she wrote in a caption addressed to her 9.9 million followers that her health problems are now having an effect on her singing ability.

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She wrote: "Yesterday I tried to sing a song I can usually sing [with] ease, and I couldn’t. The issue I’m having isn’t my voice but is [affecting] my voice.

And well… I sobbed. For hours. I let myself feel the broken part of me that sometimes I know I ignore when I shouldn’t. Like fell the floor TV show type s**t.

"6 months in and I still cannot get through a full day without pain in my mid-neck/throat. Some days are so much better than others.

"The worst part is that it's not my vocal cords. They are healthy and in there with their hands up like. Not us J, we got you. It’s something around them. Spine, thyroid, allergy. Who knows. The tests continue."

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She added: "I guess I'm sharing this because people are always saying to me: 'how do you stay so positive all the time' and [the] truth is I don't.

"I definitely don’t unpack and live in how I felt yesterday. But I don’t take pride in always pretending I’m ok. It’s not healthy."

Her post clearly resonated with her fans, accruing more than 3,100 comments from her many supporters as of the time of writing.

Jessie J posts heartbreaking health update, admitting she can't go a day 'without pain'