Common cold & Flu = Stink conflicts primarily. "This stinks" (e.g. the weather, or "my spouse is sick and I have to take care of him/her and now I'm worried I'll get sick too {This Stinks}). Your psyche, taking your FIGURATIVE thoughts LITERALLY tries to protect you from that which you don't want to SMELL by blocking your nasal passages and bronchi. The duration and intensity of your conflict determines whether it's a minor cold or more debilitating flu.

However, flus can also come from the healing/restoration phase of other conflicts as healing includes bacteria which are designed to thrive in warm fluid environments (100 to 105 Fahrenheit), hence the fever and excess mucous/fluid involved. The healing/restoration is simply removing or rebuilding tissue that was temporarily adjusted to aid you in managing your conflict.

Pneumonia is a bit more complicated. It results from a secondary existence, abandonment or refugee conflict which in the western world is most often brought on during a hospitalization when a person feels disoriented, like a "fish out of water" syndrome. The sick person feels alone, isolated and knocked out of their comfortable routine along with their ailment all at once. This causes the psyche to signal the kidneys to retain water which then cause excess water retention all over the body but especially in the organ/tissue that is in the healing phase which is already inflamed. When the prior conflict is in the lungs/bronchi (scare, fright, death conflicts) we see pneumonia.

As doctor Mendhelsohn ("Confessions of a Medical Heretic) recommended way back in 1975, and whom we wholeheartedly agree with on this point, never leave a loved one alone in a hospital. Ensure you have round the clock family/friends to be with him/her. The abandonment/existence conflict (water retention) also causes many other types of complications when the previous conflict is not related to the lungs or heart. In modern times, it's most accurate to call pneumonia and a host of other diseases a "Hospitalization conflict" brought on by this situation.

I explained an infection in the above comment - this is the natural healing/restoration process of a prior conflict. In all but the most extreme cases, if left alone, your body will take care of itself.

Without putting a finer point on it, we underestimate the power of our own minds by a kajillion times. Our psyche takes our figurative thoughts literally and does not operate in illusory "time". It only understands survival in the here and now and it does a remarkable job of keeping us alive amidst real and figuratively perceived threats.

Thanks again for asking.