1. It may cause allergic reactions to some people: Cassia seed contains some aromatic substances and picric acid, which may cause allergic reactions to some people, such as stuffy nose, headache and runny nose.

2. It is easy to cause indigestion: Cassia seed contains a lot of Euryale acid and oxalic acid, which are easy to form insoluble salts with calcium and iron in the human body, thus affecting the absorption of calcium and iron, and leading to indigestion, diarrhea and other problems.

3. Not suitable for pregnant women and children: Because cassia seed contains some pharmaceutical ingredients, such as emodin and camel hoof essence, which may not be suitable for pregnant women and children.

4. Unstable chemical composition: In the process of soaking in water, the chemical composition of Semen Cassiae will change constantly, and some toxic components such as furans and flavonoids may also be released, which will have a certain toxic effect on human body.

5. Drinking too much will cause constipation: Because cassia seed contains a lot of cellulose and gorgon acid, if it is drunk too much, it will play a role in convergence and bowel consolidation, which will cause constipation and other problems.

6. Affect the curative effect of drugs: When cassia seed is soaked in water, its components may interact with drugs and affect the curative effect of drugs. Therefore, patients should avoid using cassia seed at the same time when taking drugs.