Warning signs, she says, can include disturbed sleep and changes in activity level.

But when those episodes do occur they can wreak havoc on a relationship.

During the manic phase, a person can lose his or her sense of judgment.

He tells Web MD that bipolar disorder can seriously complicate a relationship.

"The person, particularly if untreated, may be prone to changes in their mood, their personality, and their interactions that can threaten the consistency that is the framework of a relationship." He adds that not everyone with bipolar disorder experiences the distinct mood phases of mania and depression.

When Jim Mc Nulty, 58, of Burrillville, Rhode Island, got married in the 1970s, everything seemed fine at first.

"It was an absolutely normal courtship," he recalls. During his "up" or hypomanic states, he would spend huge sums of money he didn't have.Then he would hit the "down" side and sink into the depths of depression.These wild swings put stress on his marriage and threatened to run his family's finances into the ground.Depression can cause the person to withdraw completely from everything -- and everyone -- around him or her."If you're a partner with someone, it's very frustrating," Haltzman says.Navigating any romantic relationship -- whether it's dating or marriage -- can be a tricky endeavor.