Generally, cassia seeds can be brewed together with tea. Cassia seed is a commonly used Chinese medicine, and tea as a beverage, the two together brewing water generally does not produce side effects on the human body. However, the effective dose of tea is limited, it is recommended to follow the doctor’s instructions for medication. Cassia seeds are sweet, bitter, salty, slightly cold, attributed to the liver, large intestine meridian, with clearing heat and bright eyes (to remove the body’s heat, to promote the recovery of vision), laxative effect. It is used for the treatment of eye redness and astringency, shyness and tearfulness (eyes afraid of light, often tears), headache and dizziness, darkness and uncertainty of the eyes, constipation and other conditions. The composition of tea has tea polyphenols, plant bases, vitamins, pectins, organic acids, proteins, amino acids, lipopolysaccharides, enzymes and so on. Moderate consumption of tea has the effect of quenching thirst. In addition, severe insomnia, pregnant women and other people should not drink tea. Cassia seeds and tea brewing water has a certain role, but if the body is not adaptable to go to the hospital in a timely manner.