There is an old book that explains our air and yet another medical book explaining why.
The book called floating air was written by a man that enabled the farmer to raise thousands of chickens in 1 building, something that could not be done until air was understood.
We humans are sickly when we are protected from our AIR. To live inside a house creates abnormal pressures and vaccums upon our body. To live in a house is highly against Nature. The wind hitting the house creates a system that makes us ill. We live in air and we must have balance with our air. To live in a vaccum or pressureized room forces our mucus forming glands to expell at their weakest points.
The sinus normally has the weakest mucus membranes along with the soap bubble thin membranes of our lungs, so waste seeps out at these 2 points most of all. Our ears and even our teethe are weak spots as well.
In the time of weather change we seek the indoors more than normal and to seek indoors at all sets us up against Nature and thus comes the mucus. Soon the body adapts, it must; or it will die. So shortly after the chages our colds may go away, or when too weak, they may develope into more serious methods of expelling our waste, known as pneumonia, etc.
The cure? Outside living or at least an open wall to the outdoors.
Look at it this way. Animals behave according to the barometer, even fish react diferantly. Then you have us humans that seek indoor houses where we drastically change the air temp and create abnormal pressures, it is a wonder we are alive at all.
Look at storms, it takes very little change on the barometer to be the differance from a storm to a beautiful day and so ti is with human health; change our air pressure and you change from beautiful(health) to storm (sickness)in hours.
You see, a few herbs are but 1/5 of what is needed to undestand health in this modern world. To live in a modern house takes allot of survival education.
To live outdoors is simple, to live in doors extremely hard.