These are the catch-all databases, most useful for research of this type. Do not feel limited just to these, however. There are many more to be found on the Library's Database Page. For a quick search, use the Library's catalog:
Many databases prefer the technical term for a disease or disorder. Using the technical term may help you in a pinch. For example:
You may also consider using more specific words and phrases to assist you. There are many types of cancers, and many types of heart disease. For example: