Yin and Yang are two Chinese words to explain the duality of the universe. Yin, meaning moon, soft, dark, yielding, etc. Yang, meaning sun, hard, light, overpowering, etc. Some say that yin and yang or opposites but they cannot exist without each other. They are both interdependent, and conflicting. The relationships between yin and yang are used in traditional Chinese medicine to explain the physiology and pathology of the human body. Yin and yang are also used as a guide in diagnosis and treatment of patients.
The Five Element Theory teaches that the material world is made up of 5 basic elements which are, wood, fire, earth, metal, and water. We can adapt to the environment, but we're also dependent on it. The Five Element Theory has a generation cycle and a destruction cycle. Wood generates fire, fire generates earth, earth generates metal, metal generates water, and water generates wood.
Each of the five elements has a relationship the internal organs. (The pericardium is the membrane that surrounds the heart and is not considered an organ in western medicine. The triple heater or san jiao is also not an organ, but a function.

Wood
- Yin organ - liver
- Yang organ - gall bladder
- Season - Spring
- Weather - wind
- Color - green
- Direction - east
- Emotion - anger
- Sound - shout
- Flavor - sour
- Sense organ - eyes
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- Sense commanded - sight
- Controls - muscles, nerves, tendons, ligaments,brain
- Expands into - nails
- Liquid emitted - tears
- Smell - rancid
- Developement - birth
- Grain - wheat
- Meat - fowl
- Martial art movement - retreat
- Weapon - staff
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Earth
- Yin organ - spleen
- Yang organ - stomach
- Season - late summer
- Weather - humid
- Color - yellow
- Direction - center
- Emotion - saddness
- Sound - sing
- Flavor - sweet
- Sense organ - mouth
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- Sense commanded - taste
- Controls - fat and flesh
- Expands into - lips
- Liquid - saliva/spinal fluid
- Smell - fragrant
- Development - transformation
- Grain - rye
- Meat - ox/beef
- Martial arts movement - center, balance
- Weapon - hand
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Water
- Yin organ - kidney
- Yang organ - Urinary bladder
- Season - winter
- Weather- cold
- Color - black
- Direction - north
- Emotion - fear
- Sound - groaning
- Flavor - salty
- Sense organ - ears
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- Sense commanded - hearing
- Controls - bones
- Expands into - head hair
- Liqud emitted - urine
- Smell - putrid
- Development - storing
- Grain - bean
- Meat - pork
- Martial arts movement - gaze left
- Weapon - sword
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Fire
- Yin organ - heart/small intestine
- Yang organ - pericardium/triple heater
- Season - summer
- Weather - heat
- Color - red
- Direction - south
- Emotion - joy
- Sound - laughter
- Flavor - bitter
- Sense organ - tongue
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- Sense commanded - speech
- Controls - blood vessels/vascular system
- Expands into - complexion
- Liquid emmitted - sweat
- Smell - scorched
- Development - growth
- Grain - millet
- Meat - lamb
- Martial arts movement - gaze right
- Weapon - spear
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Metal
- Yin organ - lung
- Yang organ - colon
- Season - fall
- Weather - dryness
- Color - white
- Direction - west
- Emotion - grief
- Sound - weep
- Flavor - pungent
- Sense organ - nose
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- Sense commanded - smell
- Controls - skin and hair
- Expands into - body hair
- Liquid emitted - mucous
- Smell - rank
- Develpoment - harvest
- Grain - rice
- Meat - horse
- Martial arts movement - advance
- Weapon - knife
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