Pink wrote in the image's caption: "Maybe it's cause my mom was an ER nurse all my life- but throw me in a gown and a hook me up to an IV- and I'm a happy girl. Stomach flu sucks but morphine doesn't."
The star later clarified that she was in fact joking about being given morphine and also expressed gratitude for her fans' support.
"Thanks for all the get well wishes. And no-they don't give morphine for flu. I might have ulcers again. Because I care too much. It's a gift," Pink quipped.
Pink's mother Judith Moore notably worked as a nurse in their hometown of Doylestown, PA throughout the singer's childhood.
The star recently revealed that she has cut back on her drinking and smoking since giving birth to daughter Willow Sage Hart last year.
Pink is currently working on her sixth studio album.
Can we discuss how Miley will stomp around on stage, probably dressed as a furry giant chicken or something, loudly horking & squawking horrific jokes in her manly Southern accent, her saliva splashing the camera. It'll be like Jo Calderone except 10x worse (omg)