Do you mean; turn signal lights (how are they acting)? Hazard/turn signal switch do burnt out (in the dash below the radio); some have gotten them to work with contact cleaner (this case, turn signal blinked once and then stopped). If you have nothing; I would test the hazard turn signal switch in the dash and replace if bad. You might also check the turn signal assembly in the column; they have been know to ground out and stop working correctly or intermittently.
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As other poster indicated there are several things to check - if it were a bulb at least one of the other bulbs should work. I'd check the flasher and then the assembly on the steering column.