Two weeks ago, the charts of HMOs such as UnitedHealth (UNH), WellPoint (WLP) and Humana (HUM) were "fine and dandy," but in the last 10 days, Cramer said, they "have all broken down."

Something similar happened in the chart for WellPoint (WLP), said Cramer, which had also been increasing. It also broke down below its 50-day moving average. Fitzpatrick thinks shareholders got nervous, worrying about the stock's lack of upside, and that the stock should be sold.

Cramer's colleague Dan Fitzpatrick thinks UnitedHealth's (UNH) chart is the worst in the book, said Cramer. The stock had been hitting higher lows, indicating more aggressive demand for the stock, he said. "Buyers would pounce on UNH whenever it pulled back to its 50-day moving average," he said, which is called "support." But starting last Wednesday, the stock started to sell off, and Fitzpatrick now says the pattern is broken. That support line has turned into "resistance," said Cramer. According to Fitzpatrick, UnitedHealth is headed lower, maybe even much lower.