Being that you are 20 yrs old, you do not need the permission of your adoptive parents to search for your natural mother/parents. Since you have had a life-threatening disease, I would expect your aparents to appreciate why you need medical information...not only for yourself, but also for any future children you may have. If you live in fear of your adoptive parents finding out, don't worry about that. Contact the agency or state dept. that handled your adoption for starters...non-identifying information. It is your right to ask/demand this information. There is the possibility that your natural mother has left a letter with the agency, that she is open to contact. So please, get the information as to the name of the agency, or attorney or state dept. that handled your adoption and contact them immediately. They will not contact your adoptive parents to let them know what you are doing, as you are now of legal age. Should you have any additional questions, please feel free to contact me privately. I am a natural mother who surrendered her newborn for adoption in 1964. I searched and found in 1999, with only a hospital name, location, date of birth. Good Luck! and please don't hesitate to contact me, if I can be of any help whatsoever, I'll be glad to share what I know and/or direct you to those who can help you further.