Mixed connective tissue disease (MCTD) is an autoimmune disorder characterized by a combination of symptoms from different connective tissue diseases.

Chronic fatigue syndrome is a complex disorder characterized by severe fatigue that lasts for more than six months.

Behçet's disease is a rare autoimmune disorder characterized by recurrent mouth sores, genital ulcers, and inflammation in various body parts.

Acute Intermittent Porphyria (AIP) is a rare genetic disorder that affects the production of heme, causing periodic attacks of severe abdominal pain.