1. Avoid drinking tea on an empty stomach, as it can harm the spleen and stomach.
2. Avoid drinking tea that is too hot; it's best to have it below 56°C.
3. Avoid drinking cold tea, as it can cause cold stagnation and phlegm accumulation.
4. Avoid steeping tea for too long to prevent oxidation and bacterial contamination.
5. Avoid brewing tea too many times, as harmful trace elements are released in the last infusions.
6. Avoid drinking tea before meals, as it can dilute stomach acid.
7. Avoid drinking tea immediately after a meal, as the tannins can interfere with digestion.
8. Avoid taking medicine with tea, as the tannins can affect the medicine's efficacy.
9. Avoid drinking tea that has been left overnight, as it will spoil.
10. Avoid drinking tea after consuming alcohol, as it can harm the kidneys.
11. Avoid drinking strong tea, as the caffeine can be addictive and toxic.
12. Teas that are not suitable for drinking include scorched-tasting tea, moldy tea, and tea with mixed flavors.