It can start as an ache
or a choke on the intake
It becomes something you make
even, a reason to bake
But it could turn out to be fake
worn with no give, only take
Then havoc will wreak
where, all for its sake
a vital part begins to break
until the day you awake
to the monstrous mistake
and simply, give it the shake
Heartspell 
Really quite enjoyed the levels of meaning this one can take.