Can drinking herbal tea really help reduce internal heat when you have excessive internal heat?
Generally speaking, drinking herbal tea when experiencing excessive internal heat (commonly known as "fire") can have a certain auxiliary effect in reducing heatiness, but its effectiveness varies depending on the type of heatiness and individual differences, so it shouldn't be blindly relied upon. Detailed analysis is as follows:

Herbal tea is mostly brewed from heat-clearing ingredients such as chrysanthemum, honeysuckle, and mint. These ingredients are naturally cooling in nature, and moderate consumption can help relieve discomfort caused by excessive internal heat, such as dry mouth, sore throat, and swollen throat. It can play a certain positive role in regulating excessive body heat.
However, herbal tea is not suitable for all types of excessive heat. If the heatiness is caused by a deficiency-cold constitution, consuming herbal tea may worsen the body's coldness, leading to discomfort such as abdominal pain and diarrhea. Moreover, excessive consumption of herbal tea may irritate the gastrointestinal mucosa and affect digestive function. Therefore, it is important to control the amount consumed and choose an appropriate type of herbal tea based on one's own constitution.
Herbal tea should be consumed together with mild foods such as congee and vegetables to reduce gastrointestinal irritation. In daily life, maintaining a balanced diet, avoiding spicy and stimulating foods, and maintaining regular作息 (作息 means作息 schedule/lifestyle here, maybe better to use "regular作息 routine" or "regular作息 schedule")作息 habits are more effective ways to improve excessive heatiness and maintain bodily comfort.