Another manifestation of chi is Yin and Yang.

Yin and Yang are polar opposites yet they support each other, can transform into each other, and can be seen in all aspects of life including the human body, right down to the atomic level and beyond into quantum physics.   One does not exist without the other.

We see it in nature.  For example the sun and the moon.  We see the sun during the day and the moon by night.  In this instance the moon is seen as yin and sun is seen as yang.

Yin is cooling, nourishing, moistening, dark, slow and sinking while Yang is heating, energising, functional, light, fast and rising.

The Daily Cycle of Yin and Yang

Yin and yang is found in all aspects of our lives which helps us to understand what is going on with the body.

Yang is light, fast, energising and rising.  When we wake up in the morning after a good sleep we should be feeling bright and refreshed.  This is great!  This means we have a healthy supply of Yang, or we could say we have a healthy supply of chi.  What if we wake up feeling tired after a good night's sleep?  This indicates that our Yang or chi is probably a bit low.  In the morning we should have a good supply of chi or Yang, because that is when the Yang energy is at it's highest on the daily cycle of Yin and Yang.

Yin is cooling, moistening and nourishing.  We have an  example of a woman going through menopause who has hot flushes in the evening and at night.  Yin should be at it's highest in the evening and at night, so if there is a deficiency of yin, there will be a deficiency of the cooling moistening and nourishing aspect.  This deficiency means that there is not enough yin (cooling) to keep yang (heating) in check, so the symptoms of hot flushes and rising heat to the upper part of the body develop due to the nature of yang being heating and rising.

These two conditions of tiredness in the morning due to chi / yang deficiency and menopausal hot flushes due to yin deficiency are generally the result of chronic issues related to the body's general constitution.  The body's constitutional energy can be enhanced by treatments, diet and lifestyle changes.

So, can yin and yang be seen in acute conditions?

Yes they can.  Lets take the example of the common cold.  Our first symptoms of a cold are generally chills (yin) which develop into fever (yang).  If we develop a sore throat this is due to heat and infection in the throat (yang) and over time we develop scratchy dryness and pain due to lack of moisture (lack of yin).  This can happen with the flu when we have a fever as well.  The excess heat from the fever (yang) dries and dehydrates (consumes yin) so we can end up with symptoms of dryness like sore dry throat, thirst and constipation.

Some more examples of Yin and Yang!

The 2 Opposing sides of Yin & Yang

                        YIN                         YANG

             Moon

     Sun

              Water

     Fire

             Female

     Male

               Dark

     Bright

              Cold

    Warm

              Inactive

     Active

              Down

     Up

             Inwards

     Outwards

             Earth

     Heaven

              Silent

      Noisy, Loud

Yin and Yang in relation to the body

              Yang               Yin
Internal organs Fu organs

In Oriental medicine known as "Hollow" organs like Stomach, Large Intestine, Small Intestine, Bladder & Gall Bladder

Zang organs

In Oriental Medicine known as "Solid" organs like Spleen, Lung, Heart, Kidney & Liver

Blood and Qi Qi

functional & moving

Blood and Body Fluid

moistening & nourishing

Limbs Outside Inside
Emotions Excited Calm
Substance Light Heavy
Pathalogical situations Exterior, excessive

Heat syndrome

Interior, deficiency

Cold syndrome

Pulse conditions Superficial, rapid,

Slippery, excessive, big

Deep, slow, taut, deficiency, thready