The hashtag disappeared from Instagram's search engine earlier this month, Mashable reported.
Instagram user Vintageortacky questioned how the term curvy could be considered harmful after learning that the hashtag was banned.
Other variations of the search term, like #curvygirl and #curvywoman, remained active. Some users tweaked the spelling of curvy and started posting their photos under #curvee. Some Instagram users protested the site's new policy by populating their photos with those hashtags.
"Keep calm Instagram and bring back #Curvy," wrote Curvybostongal79 overtop of one of her pictures.
Loey Lane, a beauty and plus-size fashion video blogger, celebrated the return of #curvy with a bikini picture.
"It's back y'all," she wrote.
Fashionpeepshow also posted a bikini picture with "#Curvy taking it back!!!" superimposed over it.
Vintageortacky joined in the celebration. She posted a picture in one of her favourite dresses, which she said "celebrates my #curvy figure!"
However, despite Instagram search indicating #curvy had more than 2.1 million posts as of Saturday afternoon, hitting search only brings back nine results. There was no option to load more pictures.
On mobile search, all the photos appeared to be loading.
One Instagram user pointed out that while #curvy is back, #thick and #BBW, which stands for big beautiful woman, haven't been given the same reprieve.
Searching both hashtags leads to an error message.
"Sorry, this page isn't available," the page reads. "The link you followed may be broken, or the page may have been removed." It then offers a link back to Instagram's main page.
The company has previously come under fire for censoring certain types of photos, including ones of models with pubic hair, breastfeeding mothers, women's nipples and a plus-sized blogger's butt selfie.