The problem with treating a specific symptom/diagnosis is that inevitably there are other symptomless problems which may be far more serious and life threatening than the one diagnosed. This is the Achilles heel of the reductionism approach in medicine because the measures employed to successfully resolve a diagnosed condition may aggravate other unrecognized problems.
For examples: In conventional material medicine the medications used to control allergy symptoms often depress the immune system. This is not a good idea if the patient has a cancerous tumor or a chronic infection.
In alternative medicine healing therapies involve the manipulation of the patient’s subtle energy field (aura). A subject has a limited amount of vital energy available and its allocations are determined by that field of influence. Consequently if a therapist redirects the distribution of Chi in order to resolve a specific diagnosed condition there is less vital energy available for other issues.
In both of those cases the diagnosed problem may be successfully resolved but the patient’s overall health is compromised in the process. This is the reason experienced healing facilitators are inclined to balance the whole as opposed to or in addition to treating specific symptoms.