Cassia seed is sweet, bitter, cold in nature, slightly salty, and returns to the liver and large intestine meridians. Cassia seeds soaked in water and drunk can clear the liver, improve eyesight, moisten the intestines and relieve constipation. It is used to treat red and painful eyes, excessive tearing due to shyness, headache and dizziness, blurred vision, constipation, etc. It should not be used by patients with Qi deficiency and loose stools. Traditional Chinese medicine treatment requires syndrome differentiation and treatment. If the patient feels unwell, it is recommended to go to a regular medical institution for treatment. Do not use medicine at will to avoid adverse reactions.