The rapid proliferation of large language models (LLMs) in medicine highlights their potential to revolutionize research in Traditional Chinese Medicine (TCM). While these models have shown great promise in assisting TCM practitioners by answering herb-related questions, generating syndrome-differentiation reports, and recommending classical formulas, a persistent challenge that arises is the issue of hallucination, where LLMs might produce content that appears plausible yet inaccurate. This issue has received limited attention within the context of TCM research, leaving a significant gap in understanding how hallucination manifests within the unique theoretical frameworks and diagnostic principles. Motivated by this phenomenon, we present TCMPHal, the first dataset specifically curated for hallucination detection in TCM pharmacy, comprising 10,000 high-quality question-answer pairs with hallucination annotations. Our experimental results across diverse LLMs, under standard, knowledge-based, and search engine-augmented conditions, demonstrate the capabilities and limitations of these models. A notable observation is that, for thinking LLMs, incorporating search engine results yields minimal improvement over their intrinsic reasoning abilities. We further conduct an in-depth error analysis, paving the way for future research directions in this domain. We release the TCMPHal dataset at https://github.com/hanninaa/TCMP.

Event understanding and reasoning play critical roles in thoroughly evaluating the capabilities of Vision-Language Models (VLMs); however, existing Visual Question Answering (VQA) datasets predominantly focus on entity-centric questions, while event- or action-related questions are limited in scale and suffer from significant shortcut issues. We introduce MEUR, the first Multimodal Event Understanding and Reasoning dataset consisting of 1,200 images and 4,217 questions, necessitating VLMs with a diverse range of multimodal understanding and reasoning capabilities to answer, ranging from basic event recognition to more complex tasks such as counting and comparison. To streamline the annotation process, we propose a novel semi-automated pipeline that combines advanced VLMs with human annotators, achieving high quality and efficiency. We conduct extensive experiments on state-of-the-art non-thinking and thinking VLMs to demonstrate their capabilities and limitations in multimodal event understanding and reasoning. Furthermore, we provide a detailed error analysis that points out promising directions for future research.