[To explore evidence evaluation for harm: establishing the body of evidence for harm for postmarketing traditional Chinese medicine].

There has been much difference between effectiveness and harm in evidence evaluation. Many evidence ranking or grading systems have been developed'by researchers in the world. However, no evidence ranking or grading systems are based on safety research reality. Those existing evidence ranking or grading systems are prone to evaluating effectiveness evidence not proper for harm evidence. It is necessary to develop a new system for harm evidence. We put forward to establishing the body of evidence for harm for postmarketing traditional Chinese medicine as required by our daily research work. We do hope such an ideal could be helpful and indicative for evidence evaluation for harm.