Color therapy, also known as chromotherapy, is a form of therapy that uses color and light to treat certain mental and physical health conditions. We can trace this form of therapy back to the ancient Egyptians. They made use of sun-filled rooms with colored glasses for therapeutic purposes.While color psychology is the study of how different colors can influence human behavior and perception, color therapy is different. It is based upon the unproven assumption that certain colors can impact people's "energy" and impact health outcomes.

Red: Red is used to energize or invigorate a person who might be feeling tired or down. However, red may also trigger people who might already be tense.
Blue: Chromatherapists use blue to try and influence depression and pain. Darker shades of blue are also thought to have sedative properties and may be tried for people who experience insomnia or other sleeping disorders. 
Green: Green is the color of nature, and according to chromatherapists, it can help relieve stress and relax a person. 
Yellow: Yellow can be used to improve your mood and make you more happy and optimistic. 
Orange: Orange, much like yellow, can be used to elicit happy emotions from people. The bright warm color is also thought to be able to stimulate appetite and mental activity.