Hypertension (High Blood Pressure)
High blood pressure is a disorder in which the pressure of blood flow in the vessels remains abnormally high.  Hypertension is usually a more severe case of high blood pressure. High blood pressure is a chronic condition with no cure.
If you have high blood pressure, your heart will work significantly harder than normal to effectively pump blood throughout the body. Over time, this increased work can make the heart muscles too weak or stiff to pump blood efficiently. When this happens, fluids can build up and cause congestive heart failure.
Bad Heart Valves
The heart valves open and close to let blood flow across the chambers of the heart. They keep blood flowing in the right direction within the heart. Your heart valves may become damaged due to heart infections or other types of heart problems.
Faulty valves impair proper blood flow and can cause the ventricles to work harder to pump blood.  The extra exertion eventually becomes too much and the muscles may weaken over time. This can cause congestive heart failure.