Worry makes an ache—

stomach swims, head throbs . . .
It’s an unwanted guest
with endless requests.
Like an empty piggy bank
Worry offers nothing.

Which line from the poem contains a metaphor?

Worry makes an ache—
stomach swims, head throbs . . .
It’s an unwanted guest
Like an empty piggy bank

The metaphor in the poem is found in the line "Like an empty piggy bank."