Convulsions caused by calcium deficiency often show the following situations.1. They may be manifested as night terrors. The so-called night terrors refer to the patient in the process of sleep, without any triggering factors suddenly woke up, or although not woke up, but showed a series of body reaction after being frightened. For example, involuntary trembling of the limbs, increased muscle tone, or involuntary sound in the throat. 2, may be manifested as a part of the body muscle spasm, the calf is the most common part. In this case, it will usually be manifested as a muscle spasm of the back of the calf induced by a certain position, a certain action, or cold. Once this spasm occurs, the patient will often feel localized severe pain, and is accompanied by involuntary twitching of the spasming muscles. 3, for some very serious cases of calcium deficiency, may also lead to generalized convulsions, which is similar to epileptic seizures in epileptic epilepsy.