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Electrolytes are inorganic substances—acids, bases, or salts—that dissociate into component cations and anions when dissolved in water. For example, sodium chloride (NaCl) breaks apart into Na+ and Cl− ions. This ionization process is essential because the resulting ions are vital to many physiological processes in the body, including nerve signal transmission and muscle contraction.

Electrolytes are sourced from consumed foods and drinks and lost through urine, feces, and sweat. Normal electrolyte levels are essential to maintain homeostasis. Any abnormal rise or fall in electrolyte levels affects several body functions. For instance, extremely low potassium levels can cause muscle paralysis, while elevated levels induce irregular heartbeats.

Sodium functions in regulating membrane potential in electrically active cells and plays a role in active transport of ions across cell membranes. The sodium-glucose-linked transporter (SGLT1) on intestinal epithelial cells imports glucose by co-transporting two sodium ions inside the cell. Decreased sodium reabsorption in the kidneys leads to hyponatremia, causing nausea, confusion, and headaches.

Potassium ions are the intracellular counterparts to extracellular sodium. Potassium is actively transported into the cell in exchange for sodium by sodium-potassium ATPase pumps. These ions are essential for muscle activity, and any imbalance can cause weakness, fatigue, and cardiac arrhythmias.

Bicarbonate is crucial to the human body's physiological pH buffering mechanism. In blood plasma, carbon dioxide is converted into bicarbonate, which is alkaline and helps maintain the body's acid-base balance. Any drastic rise or fall in bicarbonate level indicates an acid-base imbalance in the body.

Chloride is the primary extracellular ion that maintains osmotic pressure gradient between intracellular and extracellular fluids, regulating appropriate water levels. When chloride levels rise above normal due to dehydration or excessive salt intake, hyperchloremia results. Vomiting, diarrhea, and metabolic acidosis cause hypochloremia, a condition where chloride levels drop below normal.

Magnesium is an abundant intracellular cation that regulates many enzymes by serving as a cofactor for protein kinases, helicases, cyclases, and topoisomerases. It is also involved in ATP metabolism and glycolytic pathways. Magnesium deficiency can present as neurological issues, cardiovascular irregularities, and neuromuscular alterations.