It is of course possible for a person to be mentally and/or physically ill and asexual without either of those traits being blamed for the other. Even if a physical or mental disease is part of a person’s overall reason for feeling asexual, that does not invalidate the orientation for that person; it does not become less “real” because of any illness. However, asexuality as an orientation is not a disease or a symptom. It shouldn’t be treated like an issue that can or should be cured, any more than homosexuality should.