Life What is ‘hourglass syndrome’? The dangers of sucking in your stomach too much October 21, 2022October 21, 2022 Jenna Ryu, USA TODAY Comments Off on What is ‘hourglass syndrome’? The dangers of sucking in your stomach too much Constantly sucking in your stomach for that flat, toned appearance comes with health risks. On TikTok, it's called "hourglass syndrome."