* The usual cause of tetany is a deficiency of calcium. An excess of phosphate (high phosphate-to-calcium ratio) can also trigger the spasms. * Underfunction of the parathyroid gland can lead to tetany. * Low levels of carbon dioxide cause tetany by altering the albumin binding of calcium such that the ionized (physiologically influencing) fraction of calcium is reduced; one common reason for low carbon dioxide levels is hyperventilation. * Low levels of magnesium can lead to tetany. * Clostridium tetani toxin, via inhibition of glycine-mediated and GABA-ergic neurotransmission, may lead to tetany. Cow grazing on rapidly grown pasture with tetany of the neck suggesting grass tetany * An excess of potassium in grass hay or pasture can trigger winter tetany, or grass tetany, in ruminants. * Osteomalacia and rickets due to deficiency of vitamin D Metabolic<unk>  with hypokalemia like Gitlemam syndrome and Bartter's syndrome can cause tetany. Vomiting induced<unk>  and hyperventilation induced<unk><unk>  also cause tetany because of neuronal irritability.
symptom of Respiratory alkalosis
symptom of Mouth breathing
symptom of Hypoxia 
symptom of Hypotension
symptom of Hyperthermia
symptom of Hyponatremia
symptom of Hyperkalemia
symptom of Acute respiratory distress syndrome