Kristina , It is precisely because the disability is not visible to the observer that the privacy of these students should be respected. They may need nothing from the instructor. They may need some consideration or accommodation, in which case the instructor should be provided with the information about what they can/should do. But to provide information about the disability, rather than about the instructor's role in addressing academic needs, is generally considered intrusive. It is not important for you to know whether a student needs extended time because of a learning disability, or ADHD, or depression. You just need to know to make the appropriate arrangements to assure that accommodation. It is not inappropriate to ask the student if there is more information he/she would like to share, so that you can discuss other ways you might help. But it is for the student to decide if they want to share, not for someone else to take the decision from their hands. Dr. Jane Jarrow