In love and madness

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The language of Valentine's Day cards and love songs -- "crazy for you," "madly in love," et cetera -- may reveal an important truth. Sometimes, love looks like a mental disorder, says British clinical psychologist Frank Tallis.

"Love seems to have the power to destabilize people emotionally," says Mr. Tallis, who has lectured in psychology and neuroscience at the Institute of Psychiatry at King's College in London. "Particularly in vulnerable individuals, it can be very difficult to cope."

The author of "Love Sick: Love as a Mental Illness," Mr. Tallis has a private practice in London, where he says he often has patients who are suffering mentally because of love.

"Some people are referred to me because of an admission to depression or anxiety disorder, but in fact, once we'd explored issues around their problems, it was clear they were just in love."

When people are with their beloved, Mr. Tallis says, they often experience a manic state, characterized by expansive moods, causing generous gift giving and inflated self-esteem. When they are away from the person they love, there can be tearfulness, insomnia and low mood -- mirroring the symptoms of depression.

The idea of love as a form of mental illness "is not as absurd as it sounds," author John Preston said, reviewing Mr. Tallis' book for the London Daily Telegraph. "Love ... shares a lot of symptoms with various forms of psychopathology, notably obsession, depression, mania and manic depression."

"When we fall in love we are not ourselves; our emotional center of gravity is displaced and we topple headlong into the hands of fate," Mr. Preston says. "Anything can happen. Yet 'falling in love' is a relatively recent phenomenon; it wasn't until the 16th century that the phrase passed into common currency."

But while such feelings are common for people in love, Mr. Tallis says, when taken to another level, the obsession caused by love could almost become like stalking.

"If we look at stalkers, all that happens, at least a percentage of them, is that they fall in love with someone and just want to be with them," Mr. Tallis says. "They make a nuisance of themselves, and the other party is not interested in them, but if the other party said 'yes' to their advances and their overtures, then we would regard stalkers as being ordinary individuals."

Morbid jealously is another symptom of lovesickness, Mr. Tallis says.