In the Western view of the body, energy is distributed via the major systems, i.e. circulatory, nervous, endocrine, immune, respiratory, etc. The ancient Chinese were not privy to the benefit of modern X-rays, PET scans, and diagnostic equipment. However, they mapped a very sophisticated and detailed picture of the interplay of these systems that are described as organ energies. There is an uncanny amount of overlap between the two seemingly disparate views of the energy systems in the body.
The method of communication between the brain, organs, and each individual cell occurs along the major energy pathways, or "meridians", of acupuncture. An easy way to think of the meridian system is like a modern road map. The major meridians are like highways that can veer off to major streets, then side streets, town roads, and eventually to driveways that lead right up to one house. In the body that house is like each individual cell.
Acupuncture returns the body to its natural state of balance and harmony.
Regardless of what condition a person is suffering from, there is always some form of imbalance that is not allowing the energy to flow properly. The severity of the disease is often determined by how long the imbalance has been present, and how complex the imbalance is.