You may be referred to a specialist in ear, nose and throat (ENT) disorders (otolaryngologist) if the problem has been persisting for some time, is not responding to treatment, or has occurred frequently.

CNN: Ear infection (middle ear)

This promotion frequently occurred in the past, but hardly fits the everyday-low-price mantra espoused by new CEO Ron Johnson.

FORBES: Another Sign CEO Johnson Can't Make Up His Mind About J.C. Penney

The results showed that the various technical patterns mostly occurred far more frequently than they would have done if they were truly random events.

ECONOMIST: Heads, shoulders and broadening bottoms | The

By the time this occurred, he was frequently referred to by younger people in the movement as a sort of revered elder.

NPR: The Tipping Point: When Hate Turns To Violence

That done, they plotted a series of curves, one for each decade, that showed how frequently each deviant value occurred.

ECONOMIST: Climate change