Ptomaine Instead of Chow Mein:
Three friends go to a Chinese restaurant and all order Chow Mein, but get Ptomaine poisoning.
After about 4 hours Friend 1 manifests symptoms that include: fever, chills, dizziness, diarrhea, and vomiting. Friend 2 and 3 experience no symptoms. By most people's definition, friend 1 is sick.
Four hours later, Friend 1 and 2 are fine and Friend 3 is dead.
Now this changes things.
Which one was actually sick?
Friend 1's body was getting rid of a poison when it manifests those unpleasant symptoms. A body working properly may flush poisons from the system by vomiting and diarrhea. The fever help kill germs through the increase in body temperature and by making the immune system more efficient. That did not mean that he was sick. On the contrary, it was a healthy response to the circumstances of food poisoning.
Because his body may not have been working properly, Friend 3 did not experience these symptoms subsequently, the poisons remained in his body causing enough damage to lead to his death.
What about Friend 2? His immune system may have been so strong and his body worked so well, that he was able to get rid of the poisons without having to experience any uncomfortable symptoms.
Since symptoms are a poor judge of health and how the body is working; and since we cannot always know if symptoms are good or bad; we do not use them as criteria for how often and where to adjust, or how the body is working.
It is very simple, either you are subluxated and need an adjustment or you are not subluxated and do not need one. The only way to know is to get checked regularly.