Everyone knows that being in an unhappy marriage can make people miserable.

But now, researchers have suggested it could even prove fatal.

US researchers believe that an unhappy marriage can cause stress which, in turn, affects physical health.

They believe people who are unhappy with their spouse could be at higher risks of depression, high blood pressure and even heart disease.

As a result, scientists at Michigan State University are set to study how marriage affects cardiovascular health.

They say this is particularly important at a time when one in four people in the US die of heart disease.

Dr. Hui Liu, the lead researcher said: “The importance of this study is highlighted by the continued high prevalence of cardiovascular disease in the United States.

“We plan to provide nationally representative evidence on how marriage affects cardiovascular health and elucidate the multiple mechanisms in this relationship.  The findings will have important implications for health policy and practice’.

The researchers say most cases of heart diseases are preventable, meaning identifying risk factors is crucial to the design of effective prevention strategies.

Dr. Liu explained that scientists have long believed marriage to be the most important social relationship affecting health.

She believes, for example, that a happy marriage offers support and enhances physical health.

In contrast, she says the stress of an unhappy marriage can cause depression.

This, she says, can promote unhealthy habits such as smoking and drinking and can increase the body’s levels of stress hormones.

These hormones can result in raised blood pressure and heart rate eventually leading to heart disease.

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