The researchers, from St. George's University of London in the UK, have published the results of their study in JAMA.
They note that, sometimes, grief can lead to extra physical stress and can also make people lose interest or forget to take their medication.
To investigate bereavement as a risk factor for cardiovascular problems, the team assessed the rate of stroke or heart attack in patients over the age of 60 whose partner died. They then compared that with individuals whose partners were still alive.
In total, there were 3,0447 individuals in the study whose partner died and 83,588 controls whose partners did not.
The researchers found that 16 per 10,000 people whose partners died experienced heart attacks or strokes within 30 days of their partner dying, compared with only 8 per 10,000 from the control population.
After 30 days, however, this increased risk began to fall in individuals who lost a loved one.
Grief increases cardiovascular risks
There has been evidence from other previous studies that partner loss and grief can lead to changes in blood clotting, blood pressure and heart rate control, Dr. Shah says.
"In addition, we have found, in another study, that in the first few months after bereavement, individuals may not consistently take their regular preventive medication, such as cholesterol-lowering drugs or aspirin," he adds.
All of these factors can contribute to increased risks of cardiovascular events, and Dr. Shah says it is important for doctors, friends and family to be aware of these increased risks.