Lupus is another autoimmune disease where the immune system begins to attack the body rather than defend it. Lupus can present a variety of symptoms, some of which may be apparent (like a butterfly rash), but others (like flu-like fevers, chronic fatigue, and internal organ complications) are not visible.
14 Invisible Illnesses You May Not Know About

You forgot about CRPS or RSD they are both the same and extremely painful with no cure