How Did the Phrase “Mad As a Hatter” For Someone Irrational Originate and What Does the Expression Mean?

Years ago, manufacturers of felt hats used mercury to treat the wool, which made it easier to pound the fibers into felt.

Mercury poisoning attacks the nervous system, which caused many hatters to develop tremors and then madness.

In Alice’s Wonderland tea party, she met not only a Mad Hatter but also another descriptive expression, “mad as a March hare.”

how did the phrase mad as a hatter for someone irrational originate and what does the expression mean

The hare breeds during March, so he might be excused for his absurd antics.

About Karen Hill

Karen Hill is a freelance writer, editor, and columnist for Born in New York, she loves interesting random facts from all over the world.