Magnesium and potassium, along with sodium and calcium, are examples of electrolytes that are present in the blood. Electrolytes help trigger and regulate electrical impulses in the heart and low levels of magnesium and potassium can lead to an electrolyte imbalance, which can contribute to arrhythmia.
Passing hard stools is usually as a result of constipation or the infrequent movement of the bowels. Most healthy people have at least three bowel movements per week, according to MedlinePlus. If you are unable to have a bowel movement or are having difficulty passing stool, contact your doctor.
1 Fecal impaction is a large mass of dry hard stool that gets stuck in the rectum-it is literally so hard that it cannot come out. 2  Rectal cancer-tumors that develop within the rectum can cause bowel incontinence. 3  Rectal prolapse-if the rectum drops down into the anus, bowel incontinence can occur.