THE CAUSE OF DISEASE.

In Acupuncture, all disease may be treated according to the manipulation of qi (or energy).  In Traditional Chinese Medicine the cause of disease may be external or internal. These occur when the body and mind become out of tune with itself and a blockage occurs in our meridians/pathways.
When our body becomes ill sometimes we suffer from an infection or an "invasion of pathogens". Therefore, we need to strengthen our immunity ("wei-qi"). These are the "Six External Evils" or "Six External Diseases". In Chinese Medicine these are some of the main causes of disease.
"Six External Evils".
Heat
Cold
Damp
Wind
Summer Heat
Dryness
Keeping the "wei-qi" strengthened (immune system) is vital for a person's health and well-being. Sometimes these may transform  into an internal pathogenic factor and affect one of our main organs.

Internal Cause of Disease.
Internal cause of disease is centred around our emotions and how they affect each organ in the body. This is extremely important in Traditional Chinese Medicine (TCM) and Acupuncture and indeed Homeopathy. How we feel and react to situations can affect each organ in the body and therefore affects our qi(energy) in the body. The Internal Cause of Disease may also be called "The Seven Emotions".
"The Seven Emotions".
Fear affects the kidneys.
Anger affects the liver.
Over-thinking affects the spleen.
Worry affects the spleen.
Sadness affects the lungs.
Over-joy affects the heart.
Shock affects the heart/kidneys.
When our internal organs are affected Acupuncture is not only necessary but vital for a person's well-being.