It sets up a weak spot in the body that is more easily injured and inflamed. A person may go many years before a recurrence. This is common when someone sprains an ankle when they are young and when they are much older, start to have trouble with the ankle. Car accidents will set up this condition. Many people think they were not hurt in an accident, but months or years later, start to have headaches and neck trouble caused by the myofascial adhesions and degenerative condition set up by the accident.
Many people have pain often, or perhaps only once or twice a year.
This is due to the low-grade inflammation that is present in the muscle that activates with a little more body stress than it wants to deal with at the time. These stresses are cumulative, and pile up until the body decides it will take no more. Once the roots are there, it will grow again and again with just a little bit of water. You have to work very hard at keeping the roots and seeds weeded so that the condition will not take over. In the case of myofascitis, this means getting treatment of some kind.