Some of the conditions that make up this category of illness include:
- Fibromyalgia
- Myalgic Encephalomyelitis/Chronic Fatigue Syndrome
- Lyme disease
- Co-infections of Lyme including opportunistic infections such as Chlamydia pneumoniae, Mycoplasma pneumoniae as well as Babesia, Bartonella, Ehrlichia, etc.
- Mold toxin illness
- Chronic viral infections like Epstein Barr