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.
Stools that are hard are normally a result of a condition known as constipation. When the stools remain in the GI tract for more than 48 hours, any fluid contents in them was reabsorbed by the body. This causes the stool to become dry, hard and difficult to pass from the body. In exceedingly severe cases it may cause pain and bleeding while passing these stools.