Caffeine is a central nervous system stimulant, in milk tea as well as coffee contains traces of caffeine, appropriate consumption of caffeine can play a refreshing, waking effect. If caffeine is consumed in excess, the patient may experience mental overexcitement, muscle tremors, and in severe cases, muscle twitches, and emotional irritability and anxiety. If caffeine is consumed in excess, it can also affect the patient’s heart function in severe cases, and the patient may show palpitations or arrhythmia. Excessive caffeine intake can also lead to peptic ulcers, which can cause gastrointestinal bleeding in severe cases. Normal consumption of caffeine can be metabolized in 3-4 hours, and if overdosed, patients are advised to drink more water in moderation. If the patient experiences excessive central nervous system excitement or palpitations, it is recommended to consult a hospital if necessary.