RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A chronic cystitis characterized by unpleasant sensation related to the bladder and lower urinary tract in the absence of identifiable causes and has_symptom pain, has_symptom pressure, has_symptom discomfort, has_symptom dysuria, and/or has_symptom urinary frequency. (DO)