It says here:
The average unbodied Maia
Basically insecure
Due to some long frustration may react
With psychosomatic symptoms
Difficult to endure
Affecting the substance he still has intact.

In other words, just from waiting around for that plain little band of gold
A being can develop a cold.

You can feed him with slaves who’re despairing from the Morgul Vale’s mirk
You can give him a lot of whatever you’ve got, but it just won’t work
If he’s tired of seeing the bootlicking Istari smirk
A being can develop a cold.

It says here:
The Maia remaining mighty
Just in the legal sense
Shows a neurotic tendency, see note:
Chronic unstable symptoms
Toxic or hypertense
Involving the eye, the tower, the gate, and moat.

In other words, just from worrying if the One Ring is on or off
A being can develop a cough.

You can torment his foes with uncountable woes and the Haradrim
But as desperate as the poor Gondorians get, he’s still twice as grim:
As the battle for all of Middle Earth nears, and no Ring’s for him
A being can develop a cough.

And furthermore, just from stalling, and stalling,
And stalling the Ring’s return
A being can feel his stomach churn.

When the Riders climb on their black horses
He can hear Elves despair
The White City is ready to fall,
Fell beasts in the air.
Then an upset at Pelennor Fields and the Ring’s not there!
A being can develop la grippe,
La grippe.
La post nasal drip.
With the wheezes
And the sneezes
And a sinus that’s really a pip!

From a lack of his magical property
And a feeling he’s getting no gold
A being can develop a bad, bad cold!