10 Causes of Pneumonia

7. Weakened Immune Systems

When our bodies are fighting off other infections or illnesses, it begins to take a toll on the immune system. When the immune system is in this weakened state, it makes us more susceptible to other diseases and conditions. There is even a form of pneumonia that commonly originates in this way. Pneumocystis carinii pneumonia is particularly dangerous because it generally affects both of the lungs. Because it attacks the body when it is functioning at a weakened state, it makes it that much easier to spread from one lung to the other.