Abstract: A computer-implemented method for medical diagnosis, comprising: receiving a user input from a user, the user input comprising an input symptom; determining a measure of relevance of a plurality of items of medical data to the user input, wherein the plurality of items of medical data are items of medical data for which information associated with the user is stored; determining whether to include the stored information corresponding to an item of medical data in a first set of information, based on the measure of relevance for the item of medical data; providing the user input and the first set of information as an input to a model, the model being configured to output a probability of the user having a disease; and outputting a diagnosis based on the probability of the user having a disease.