Like an infectious disease, the negative emotions of one family member can have long-lasting effects on the mental and physical health of the rest of the family.

A Chicago meat packer comes home after a long day of tough physical labor in a smelly and otherwise disagreeable workplace. He arrives home in a black mood and sulks, ruining the moods of his wife and children as well. His wife feels caught in the middle, wondering what she can do to make the home atmosphere lighter. She flits back and forth between her most sensitive child, her daughter and her husband, trying to brighten the evening. But when dad is in one of his moods, the kids get depressed and think the tension in the air is somehow their fault. Sometimes, the kids get so blue that they can't concentrate or finish their homework.

An Insidious Poison

Like secondhand tobacco smoke, psychologists have shown that frequent exposure to negative emotions can have a toxic effect on the rest of the family members, sometimes even affecting their physical health. One study, for instance, found that the children who were repeatedly exposed to adults' negative emotions are at greater risk for ]]>heart disease]]> and ]]>depression]]> .

Study authors Reed W. Larson of the University of Illinois and David M. Almeida at the University of Arizona at Tucson say that the repeated daily experience of secondhand emotions can travel from one person to another in a family. This can even be a means by which parental distress, ]]>anger]]> or depression leads to the same conditions in other family members, particularly children.

The Research

Professors Larsen and Almeida studied 450 families over three years. They peeked in on the activities, moods, and emotional lives of the study subjects through diaries and by calling to ask how they felt. Other families filled out questionnaires about the effect of secondhand emotions in their lives.

"The most consistent finding was that negative emotions can create a chain reaction of distress that moves through a family, affecting everybody's behavior and eventually, their well-being," says Dr. Almeida, a professor of family studies and human development. "These emotional spillovers also appear to follow the order of power in a family, from fathers to mothers to children."

On days when work has been especially rough, for example, our meat packer sneaks off to the race track, where he sometimes wins. When he comes home with winnings, the mood of the entire family is upbeat and happy. But an upbeat mood is quickly reversed if he loses money at the track.

The study also revealed that an emotion can be transformed from one person to another in its transmission. For instance, scorn in one person may induce shame in another; anger in a powerful person can create anxiety in a less powerful family member.

The study of emotional transmission, printed in the February 1999 issue of the Journal of Marriage and the Family along with three other studies, revealed that negative emotions like anger, depression, and anxiety are more likely to be transmitted within a family than are positive emotions. Contagious joy within families seems to be a rare thing indeed.

Ways to Communicate

"If couples or family members can just communicate the reason why they are in a bad mood, others at home are less likely to catch that negative emotion," says Dr. Larson, a psychologist and professor of human development at the University of Illinois at Urbana-Champaign. "But if dad just bottles up his feelings and snaps at the children when he comes home, they're far more likely to think his dour mood is due to something they've done, and then they become even more depressed."

If the head of the family is a woman, negative moods will also flow downhill and affect the other family members. Geraldine Downey, PhD, a Columbia University professor, studied single mothers in chronic pain and compared them to similar mothers in good health. She too found that negative emotions are easily transmitted to others in the family. But when children fully understand that their mother's bad mood is in response to a painful medical condition, they don't blame her mood on themselves.

In cases where there is clear justification for ill temper, family members tend to relax more and the toxic emotions are less likely to be transmitted. In one family studied, the husband was experiencing the rigors of the New York Bar Exam and was generally uptight and on edge. However, his wife didn't feel intimidated by or responsible for his dour mood because she knew what was causing it.

Techniques for Sparing Your Family

Families can not allow issues to disintegrate to the point where a parent comes home every evening in a lousy mood, throws things, slams doors, and yells at others. "All our research has shown that highly distressed parents have highly distressed children," says Dr. Almeida.

"The healthy thing to do is to decompress before coming home," says Dr. Almeida. "If the commute is a major headache, maybe an uptight dad could do ]]>yoga]]> or some other workout before driving home and facing more ]]>stress]]> in traffic. The second technique is to just tell everybody at home why you had a bad day." This gives them a chance to empathize and help you.

With many of today's families headed by two working parents, both of whom may have stressful jobs, it might be helpful to just say, "There was a big snafu at work, I'm a bit grumpy now and if you can cut me some slack, I'd really appreciate it." Some families have a routine where each parent is granted 20 minutes of 'quiet time' before rejoining the family. This includes stay-at-home parents, whose stress is often no less than his or her working spouse.

Researchers say that talking openly about stressors also teaches children that not every day is a happy day, and that sometimes people are grouchy. This is also a good time to teach them that they will have to deal with people who are not always pleasant.

While females are more likely than males to communicate about their good or bad moods, says Dr. Almeida, there are ways you can help draw men out. Start by instituting a regular family dinner hour so it's easier for everybody to talk and catch up on the day's events. "If father seems to be infecting everybody else with a bad mood, ask gently 'Why are you so upset?'," says Dr. Almeida. "Or, failing that, politely suggest he take a walk."