The theory behind chromotherapy is that the specific wavelength of a color has an effect on the endocrine system and the brain, influencing the body on a subconscious level.  We have personal reactions to various colors; a strong attraction to a certain color can indicate an energetic imbalance that will be corrected by that color's vibration.  Other colors may bring forth negative feelings.  Here's a quick summary:
Red is used for blood or circulatory problems, depression, lack of confidence, fatigue and pain reduction.   Too much red can cause agitation, anxiety and aggression.
Orange is used for digestive problems, weak immune system, depression, lack of joy and social withdrawal.  Too much orange can cause agitation and anxiety.
Yellow is used for mental clarity and focus, skin problems, poor self-esteem, apathy, lack of interest in life.  Too much yellow can cause exhaustion, and depression.
Green is used for calming nerves, healing broken bones, balancing emotions, relaxing tense muscles.  Too much green can cause an increase in negative energies.
Blue is used for calming nerves, spiritual protection, fever reduction and burns.  Too much blue can cause lack of compassion and depression.
Indigo is used for head colds, eye and sinus problems, purification, intuition and psychic ability.  Too much indigo can cause drowsiness and headache.
Violet is used for rheumatism, epilepsy, deep tissue work,  and for enhancing creativity.  Too much violet can cause spaciness.
Lavender is used for balancing, insomnia and spiritual healing.  Too much lavender can cause fatigue and disorientation.
Source: Fast Feng Shui by Stephanie Roberts.
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