There are two main classifications of hypolipidemia - primary and secondary hypolipidemia. Primary hypolipidemia is usually due to an inherited condition, whereas secondary hypolipidemia is mostly due to some type of medical condition. The following medical conditions have been associated with causing very low cholesterol levels:
- Hyperthyroidism
- Liver disease
- Malnutrition
- Cancer
- Chronic infections or inflammation
Sources:
The Merck Manual of Diagnosis of Therapy, 18th edition. 2006.

