Vitamin D deficiency tics are mainly diseases caused by vitamin D deficiency and reduced blood calcium, which can increase neuromuscular excitability and cause generalized convulsions. When blood calcium is lower than 1.75-1.88mmol/L or serum calcium ion concentration is below 1mmol/L, vitamin D deficiency hand-foot convulsions will be induced, and the main causes include daily picky and partial eating, bad living habits, digestive tract diseases, etc. 1. Daily picky and partial eating: daily intake of foods such as eggs, meat, soy products, etc. can lead to vitamin D deficiency and onset; 2. Bad Life habits: often home activities, do not pay attention to exercise, etc., the body does not have enough time in the sun, can lead to vitamin D deficiency and morbidity; 3, digestive tract diseases: long-term diarrhea or liver and gallbladder disorders, can reduce the absorption of vitamin D and calcium and morbidity. The main symptoms are convulsions, excessive sweating, occipital baldness, hand and foot muscle twitching or laryngeal spasms. Sedation, antispasmodic, calcium and vitamin D supplementation are needed to prevent choking during the onset of symptoms.