What did the tongue depressor say to the patient?

This medical joke delivers its chuckle through a classic bit of wordplay. The phrase "hard to swallow" typically refers to something that is difficult to accept or believe, like an unpalatable truth or a tough piece of news. However, in the context of a tongue (Review) depressor, the joke cleverly twists this idiom into a literal, physical sensation.

Anyone who has visited the doctor and had one of those flat wooden sticks pressed onto their tongue knows the feeling. While you're not actually meant to swallow the depressor, the act of having it in your mouth can certainly feel awkward and might even trigger a gag reflex, making the experience itself metaphorically "hard to swallow" for the patient. The humor comes from personifying the inanimate object, giving it a voice that acknowledges the patient's discomfort with a perfectly fitting, double-edged phrase.