Cassia seed is a kind of Chinese herbal medicine, which is widely used to treat edema, blurred vision, dry mouth, hypertension and other symptoms. However, cassia seed also has side effects and harms, as follows:

1. Dose can cause diarrhea: when the dosage of cassia seed is too large, gastrointestinal discomfort such as diarrhea can occur.

2. Allergic reaction: Some people may have allergic reactions to cassia seed, including urticaria, swollen lips and difficulty breathing.

3. There is a certain burden on liver and kidney: the use of cassia seed may cause a certain burden on liver and kidney, and patients with hepatic and renal insufficiency need special attention.

4. Contraindications for pregnant women: Pregnant women should not use cassia seed, because it contains oxalate, which has a certain impact on the fetus.

5. Drug interaction: Cassia seed contains some active ingredients, so we should pay attention to the interaction with other drugs when using it, so as not to aggravate the condition or cause unnecessary harm.

Generally speaking, although cassia seed has certain efficacy, it needs to be judged according to the specific situation when it is used to avoid unnecessary side effects and harm. If you feel unwell, stop using it in time and consult a doctor or pharmacist.