Calcium deficiency tics are mostly small muscle groups occurring tics, common symptoms manifested in the hands, face, calves and even the whole body occurring muscle tics. 1. Hand: Because the muscle group of the front wall of the human body is small, it is easy to have muscle cramps. Cramps mostly manifested as five fingers to the center of the gathering, in the shape of a claw, as a typical symptom. 2. Face: Calcium deficiency in the human body can also lead to facial muscle twitching. Patients can observe whether there are involuntary facial twitches by tapping the facial nerve under the external auditory canal. 3. Calf: Calf is the common twitching part of calcium deficiency twitching, usually due to cold-induced twitching of the muscles at the back of the calf. Twitching is often accompanied by intense pain. 4. Whole body: When calcium deficiency is very serious, it may lead to convulsions all over the body, which may be accompanied by impaired consciousness. This may be accompanied by impaired consciousness. It may be manifested as sudden collapse and shrinking into a ball. When the patient has these convulsions, it is recommended to go to the hospital immediately for further diagnosis and treatment.