This paper discusses the representation and caching of medical data structured and stored as XML documents. Caching of XML medical data is proposed towards improving the medical data accessibility and availability. The representation of XML medical data is a tree like structure and the caching process is guided by frequency of access of the XML medical data records. Experimentation is carried out for an artificial workload of patient records and both cache and byte hit ratios are evaluated. The proposed caching scheme is proven to be quite effective and beneficial for accessing the medical data.