Being built out of plant material, anything we need, should be available in the vegetable kingdom. Herbs are the natural treatments, often easily available in our own vicinity. A knowledge, which was common good, like it still is in animals. This does not mean that any disorder in human life can be treated. After growth, decay has to follow.
Birth carries the promise of death.
It is the same misconception again, that gives us a deformed idea about disease. If fungi lives on plant, you could call it a disease of the plant, but the fungi is having the time of its life. Like changing cloth, does not mean a change of person. Now back to this knowledge. When some not familiar substance enters a body there will be reaction, a physical counter attack.