Stomach

The stomach is a muscular, hollow, dilated part of the digestion system which functions as an important organ of the digestive tract in some animals, including vertebrates, echinoderms, insects (mid-gut), and molluscs. It is involved in the second phase of digestion, following mastication (chewing).
The stomach is located between the esophagus and the small intestine. It secretes protein-digesting enzymes and strong acids to aid in food digestion, (sent to it via oesophageal peristalsis) through smooth muscular contortions (called segmentation) before sending partially digested food (chyme) to the small intestines.

Electrolyte imbalance

Electrolyte imbalances can be caused by a deficiency or an overabundance of minerals in the body. For example, hyperkalemia and hypercalcemia are indicative of excess amounts of potassium and calcium, respectively, which can disrupt the overall balance and functioning of the nerves, cardiovascular system, and muscles.