Stress and Your Heart. More research is needed to determine how stress contributes to heart disease â the leading killer of Americans. But stress may affect behaviors and factors that increase heart disease risk: high blood pressure and cholesterol levels, smoking, physical inactivity and overeating.
Black or dark stools are a common side effect that may be the harmless result of unabsorbed iron. Whether you are taking iron supplements alone or a multivitamin with iron, you may experience this. Check with your doctor or healthcare provider to find the cause of black stools.
Sponsored. 1  During pregnancy, the stool appears black because of iron and vitamin supplements. 2  As your uterus enlarges, the increased pressure within the pelvis may cause constipation and hemorrhoids. It often leads to internal bleeding and the stool appears dark.