A change in serotonin levels on its own would not be enough to cause heart attacks, Wulsin said, but it could very well be a factor. It's probably a combination of these factors and others we don't know about. After a Heart Attack These findings may help researchers understand why it is that people who have major symptoms of depression following a heart attack have a much greater risk of dying from a heart-related disease later. Doctors used to think that people who were diagnosed with depression following a heart attack were simply responding to the traumatic event. It would most convincingly argue that depression is indeed an important risk factor for heart disease.
Some symptoms of depression are Persistent sad or empty mood.
Loss of interest or pleasure in ordinary activities. Decreased energy, or feelings of fatigue. Feelings of worthlessness, guilt, or helplessness. Noticeable change in eating patterns. Difficulty concentrating, remembering, or making decisions.