Eclampsia is a life-threatening complication of pregnancy characterized by high blood pressure and the presence of protein in urine. The pregnant woman can suffer seizures or coma. It can result in the death of the mother and/or the baby. (Viewers of "Downton Abby" might remember this was what caused the death of fictional character Lady Sybil.) Are you familiar with this ailment?

Complex Regional Pain Syndrome is a chronic condition that causes continuous, intense pain that may spread throughout the entire body. CRPS sometimes develops after an injury to an arm or leg. The pain from CRPS is excruciating. Are you familiar with this ailment?

Hemophagocytic Lymphohistiocystosis is a disease of the body's defense system that usually occurs in infants and small children, but can be found in adults. HLH is a life-threatening condition caused by an overactive, abnormal response of the immune system that causes organ damage. If drug treatments prove ineffective, sometimes doctors perform a stem cell transplant to try to save the patient. Are you familiar with this ailment?

Buerger's Disease is a rare condition in which vessels in arms and legs become inflamed and can become blocked with blood clots. The damage to tissue can lead to gangrene which could require amputation. Most patients diagnosed with Buerger's Disease use tobacco products. Are you familiar with this ailment?