Yin-Yang: Balancing the Opposites.

Chinese Medicine explains Menopause as a natural condition when the endocrine and nervous systems go out of balance. But from a Western medical point of view, menopause is a disease caused by a drop in estrogen and progesterone levels. Insufficient levels of these vital hormones are explained by doctors as the main cause behind the appearance of symptoms attributed to menopause.
Yin is the black half of the symbol and is associated with the female gender, as well as the calmer, cooler, less energetic substances that sustain life. Yang is the white half and is seen as representing the male force or the active and energetic elements of nature. Together these two halves emphasize the fact that everything in nature is controlled by a never-ending balance between Yin and Yang.
Any of the opposing forces that we so regularly see in nature can be used as a living example of how Yin and Yang work.
The cycle of sunrise (Yang) and sunset (Yin) is a great example. The sun signals the start of the day for both humans and animals. As the day goes on, we spend the energy we have accumulated over the night and slowly become tired. This is when the sun sets, and everything begins to rest in preparation for the next day.
Without sunrise, we would have nowhere to spend all the energy we save up during the night. At the same time, though, without sunset, we wouldn’t get a chance to rest and recover the energy we lost during the day. Without light, there cannot be dark; without dark, there cannot be light. Menopause is one of the best examples of Yin-Yang theory. Menopausal women always complained of hot flashes and cold sweat. Chinese medicine explains it as an unbalanced yin and yang, which can switch between them in a matter of minutes.
There are many other examples of how the Yin Yang balance is a basic part of nature: winter (Yin) and summer (Yang).