Hello Dear,
Known causes of potassium deficiency include excessive diarrhea and
vomiting. The treatment in these cases should be for the diarrhea and
vomiting, and ensuring there continues to be sufficient potassium in the diet. Mineral supplements may also be necessary. If the vomiting is self-induced, as in bulimia, psychiatric treatment may be indicated.
Hyperthyroidism, an illness of the thyroid, the main hormone producing gland, is also known to cause potassium deficiency.