Mercurial palsy, also known as Mad Hatter disease, is a term used to describe the neurological disorder caused by mercury poisoning. This condition manifests as tremors, muscle weakness, and uncoordinated movements. While the term "mercurial palsy" is somewhat antiquated, there are other synonyms that can be used to describe this condition. These include mercurial tremor, mad hatter syndrome, and mercurial neuropathy. It is essential to recognize these alternative terms to enhance communication among healthcare professionals and ensure accurate diagnosis and treatment. Moreover, educating the public about mercury's danger and emphasizing preventive measures is crucial to reducing the occurrence of mercurial palsy.