What are synonyms of the word problem?

Here are some synonyms for the word "problem," depending on the context:

General:

* Issue

* Difficulty

* Challenge

* Obstacle

* Trouble

* Dilemma

* Predicament

* Quandary

* Conundrum

* Snag

* Hitch

* Bottleneck

* Complication

* Crisis

* Situation

* Matter

Mathematical:

* Equation

* Inequality

* Theorem

* Proposition

* Lemma

* Puzzle

Computer Science:

* Bug

* Error

* Fault

* Glitch

* Issue

Other:

* Fault

* Defect

* Flaw

* Shortcoming

* Deficiency

* Weakness

* Drawback

The best synonym will depend on the specific context in which you are using the word "problem."