That phrase is almost certainly clickbait. The full sentence is intentionally hidden to make you tap “See more.”
There is no well-established medical rule that says “If you sleep on your right side, you must have ___.” People sleep on their right side for many ordinary reasons, including comfort, habit, mattress position, pregnancy positioning preferences, or relief from certain aches.
Some health articles discuss differences between right-side and left-side sleeping—for example, left-side sleeping is sometimes recommended for people with acid reflux—but sleeping on your right side by itself does not reliably indicate a specific condition.
If you can share the rest of the post or a screenshot, I can help evaluate whether the claim has any medical basis or is just engagement bait.

