ache, ague

Ache or ache means a constant or long-lasting dull pain, either physical or emotional --
His cast came off yesterday, but he still has an ache in his leg.
He felt an ache in his heart every time he thought of her.

Ache may also mean to suffer with constant or long-lasting dull pain --
What a game! I ache all over!
That noise makes my head ache.

Ague or ague means a fit of fever, chills, sweating, and pains in the joints, caused by influenza,  malaria, or some other illness --
He has been in bed all week with the ague.
This will help with the joint pains until he gets over the ague.

Now that you know that, you can say--
"The ague left him with an ache in his hip that isn't getting any better."