Wild chrysanthemum is generally a safe food and medicine, but long-term and large-scale use may cause the following side effects:

1. Allergic reaction: A very small number of people may be allergic to wild chrysanthemum and develop respiratory symptoms. Difficulties, rash, throat swelling and other symptoms.

2. Indigestion: Wild chrysanthemum may cause gastrointestinal discomfort symptoms such as diarrhea, heartburn, nausea and vomiting.

3. Long-term use: Long-term and large-scale use of wild chrysanthemum may affect liver and gastrointestinal health.

4. Affect drug efficacy: Wild chrysanthemum may interact with certain drugs, affecting drug efficacy, such as anticoagulant drugs, hypoglycemic drugs, etc.

Therefore, before using wild chrysanthemum, it is best to consult a doctor or Chinese medicine practitioner to avoid unnecessary side effects.