Agriculture
Potassium bicarbonate has widespread use in crops, especially for neutralizing acidic soil.Potassium bicarbonate is an effective fungicide against powdery mildew and apple scab, allowed for use in organic farming. Potassium bicarbonate is a contact killer for Spanish moss when mixed 1/4 cup per gallon. History
The word saleratus, from Latin sal æratus meaning "aerated salt", first used in the nineteenth century, refers to both potassium bicarbonate and sodium bicarbonate. References
External links
Potassium Bicarbonate Handbook
OMRI Potassium Bicarbonate
Safety Data sheet - potassium bicarbonate
"Saleratus" . New International Encyclopedia. 1905.
Cirrhosis of the liver
Congestive heart failure
Nephrotic syndrome in the kidneys
Excessive drinking of fluids

Normal volume
There is volume expansion in the body, no edema, but hyponatremia occurs
SIADH (and its many causes)
Hypothyroidism
Not enough ACTH
Beer potomania
Normal physiologic change of pregnancy
Reset osmostat

Low volume
Hypovolemia (extracellular volume loss) is due to total body sodium loss. Hyponatremia is caused by a relatively smaller loss in total body water. Any cause of hypovolemia such as prolonged vomiting, decreased oral intake, severe diarrhea
Diuretic use (due to the diuretic causing a volume depleted state and thence ADH release, and not a direct result of diuretic-induced urine sodium loss)
Addisons disease and congenital adrenal hyperplasia in which the adrenal glands do not produce enough steroid hormones (combined glucocorticoid and mineralocorticoid deficiency)
Pancreatitis
Prolonged exercise and sweating, combined with drinking water without electrolytes is the cause of exercise-associated hyponatremia (EAH). It is common in marathon runners and participants of other endurance events. The use of MDMA (ecstasy) can result in hyponatremia. Medication
Antipsychotics have been reported to cause hyponatremia in a review of medical articles from 1946 to 2016.Available evidence suggests that all classes of psychotropics, i.e., antidepressants, antipsychotics, mood stabilizers, and sedative/hypnotics can lead to hyponatremia. Age is a significant factor for drug induced hyponatremia. Other causes
Miscellaneous causes that are not included under the above classification scheme include the following:

False or pseudo hyponatremia is caused by a false lab measurement of sodium due to massive increases in blood triglyceride levels or extreme elevation of immunoglobulins as may occur in multiple myeloma.