Neurology is actually the branch of medicine which deals with troubles of the nervous system, which contain blood vessels, the brain, nerves, and muscles. The prime regions of neurology are: the autonomic, peripheral and central nervous systems. Anyway, Neurological troubles usually vary between infants and young adults and children.

The elevated irritability of the facial nerve, demonstrated by "twitching of the ipsilateral facial muscles on percussion over the branches of the facial nerve, came to be known as Chvostek sign". This clinical outcome has become vastly admitted in the medicinal community as a mark of hypocalcemia (Hujoel, 2016).

The relationship of Chvostek sign with normocalcemic ailments like epilepsy and migraines further calls into request its function as a mark of hypocalcemia (Ahmed et al., 2004).

Chvostek’s sign (CS) is actually a non-specific mark of nerve sensibility to a mechanical stimulus as well, it is a proof of neuromuscular hyperexcitability (NMH). However, positive CS has been notified in normal individuals, hospitalised sick people, those with hypocalcaemia or another troubles, like migraine (Thomas et al., 1992). Whereas, a positive Chvostek sign as demonstrated by Hujoel, (2016) is informative of normal to elevated serum calcium standards rather than hypocalcemia.

Chvostek's Sign was primarily depicted in 1876, as a clinical guide linked with sick people who experienced from latent tetany, and is stimulated by percussion of the jaw angle (Hasan et al., 2014).

In short words, the Chvostek Sign is actually a clinical finding linked with hypocalcemia, or low standards of calcium in the blood. And this clinical mark returns to a twitch of the facial muscles which happens when softly tapping a person's cheek, in front of the ear.

References:

Ahmed, M., Martinez, A. et al. (2004). Chvostek's sign and hypocalcaemia in children with seizures. Seizure, 13:217–222.

Hasan, ZU., Absamara, R. et al. (2014). Chvostek's sign in paediatric practice. Curr Pediatr Rev., 10(3):194-7.

Hujoel, I. A. (2016). The association between serum calcium levels and Chvostek sign: A population-based study. Neurology Clinical practice, 6(4): 321–328.

Thomas, J., Thomas, E. et al. (1992). Serum and erythrocyte magnesium concentrations and migraine. Magnesium Research, 5: 127-130.