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.
Causes of constipation. Constipation usually occurs when stools remain in the colon (large intestine) for too long, and the colon absorbs too much water from the stools, causing them to become hard and dry. Most cases of constipation aren't caused by a specific condition and it may be difficult to identify the exact cause. However, several factors can increase your chances of having constipation, including: not eating enough fibre, such as fruit, vegetables and cereals.