The body actually has healing priorities, and a certain order to the healing process. In order from highest priority and addressed first to lowest priority and addressed last, the priorities are:
Another way to describe this is that the body wants to live. If an organ or limb is optional for immediate survival it will be addressed later. The brain, heart and lungs are immediate. Organs of digestion and elimination are needed fairly quickly. Movement, especially in the extremities, is low in priority. Reproduction is low as well.
When working on restoring balance and health, issues are usually addressed in this order:
stomach and pancreas
hormones and reproduction
Healing also typically occurs from the inside to the outside, meaning internal before external. Healing also typically occurs from most recent symptom to oldest symptom. These are generalities, and not laws. The body knows best. This is an excellent research article on the order of healing from the homeopathic perspective.
A final very important point is that if symptoms are treated with drugs and suppressed, the illness can be driven deeper into the body and made more serious. For example, skin conditions that are treated with topical steroids may actually be the body attempting to eliminate toxins through the skin. Suppressing that path of elimination may keep those toxins in the body doing damage.
There is more to healing of course, getting into the energy fields around the body, the spirit, miasms carried from parent to child and more. This is just the tip of the iceburg. Overall, the message is that treating symptoms rather than digging for the root and restoring balance may actually harm more than it helps.
The biggest most important rule of healing? FIRST DO NO HARM