The hazards of boiling litchi core water mainly include allergies, damage to the gastrointestinal tract, and heat symptoms, and attention should be paid to changes in the body after taking medication.

1. Allergy: If you have an easy-to-allergy constitution, drinking it may cause an allergic reaction, and symptoms such as skin itching and red rashes may easily occur.

2. Damage to the gastrointestinal tract: After drinking litchi water, it may cause certain stimulation to the gastrointestinal mucosa, and long-term consumption may damage the gastrointestinal mucosa, generally resulting in nausea and vomiting.

3. Heat: The core of litchi is a warm and hot food. If it is consumed in excessive amounts over a long period of time, it may cause symptoms such as dry mouth and thirst, and red eyes.

In addition, there may be phenomena such as increased frequency of defecation, post-meal fullness, and accelerated heartbeat. If there are obvious discomforts, it is recommended to seek medical attention in a timely manner.