Clinical manifestations of hypocalcemia in children include hand and foot twitching, convulsions and laryngeal spasm, etc. According to the degree of calcium deficiency and the physical condition of children themselves, there may be differences in clinical manifestations among individuals. 1. Convulsions: children may have sudden onset of limb twitching, facial muscle tremors, confusion, and prolonged seizures may be accompanied by perioral cyanosis. After the convulsions stop, the consciousness is restored, the spirit is depressed and fall asleep. Children usually do not have fever, manifested as feverless convulsions. 2. Hand and foot convulsions: common in children, sudden spasm of the hands and feet in the form of bowing, hands in the form of wrist flexion, foot and ankle joint extension. 3. Laryngeal spasm: Hypocalcemia can cause sudden spasm of the vocal folds and laryngeal muscles in severe cases, even leading to asphyxia, which can easily lead to death. In addition, children with hypocalcemia may also have symptoms such as restlessness, tremor, jumping and convulsions. If any of these symptoms occur, you should go to the hospital immediately and get treatment under the doctor’s guidance, so as not to miss the treatment time and cause serious consequences.