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.
Some people do not have a bowel movement every day. Also, some healthy people always have very soft stools. Other have firm stools, but are able to pass them without problems. When you do not have frequent bowel movements, or it takes a lot of effort to pass stool, you have constipation. Passing large, wide, or hard stools may tear the anus, especially in children. This can cause bleeding and may lead to an anal fissure.