Assuming you mean a biological/ medical dilemma, it is one where the bodys regulatory mechanisms for maintaining a steady state (eg of body temperature or some other internal factor - blood sugar level or whatever) are unable to do so either because they are not functioning properly or because they are unable to deal with the particular circumstances you are in (eg you are lost in the dessert or have been force fed 5 kilos of sugar to cite the above examples). The reultant situation is known as a regulatory dilemma.
Dilemma is a noun.
The original dilemma opposed to the modern dilemma is the controversey of freedom vs. order whereas the modern dilemma is freedom vs. equality
An alliterative sentence for dilemma is "Danny dared Don to draw a dramatic dilemma."
I was perplexed by the dilemma.
The duration of The Dilemma is 1.97 hours.
Dilemma + scientist= philosophy
His Lordship's Dilemma was created in 1915.
The Butler's Dilemma was created in 1943.
Ecsenius dilemma was created in 1988.
Jackson's Dilemma was created in 1995.
The Wizard's Dilemma was created in 2001.
The Omnivore's Dilemma was created in 2006.