What type of organs are referred to as Yin organs?

Yin organs, in the context of Traditional Chinese Medicine, primarily refer to solid organs within the body. These include organs such as the heart, liver, spleen, lungs, and kidneys. The classification of Yin organs is based on their functional characteristics, where they are associated with the storage and processing of essential substances, including blood, Qi, and bodily fluids. They are considered to have a nurturing, stabilizing role in contrast to Yang organs, which are typically involved in the movement and transformation of substances and are often classified as hollow organs.

Recognizing that Yin organs are solid helps differentiate them from hollow organs, which include the stomach, intestines, bladder, and gallbladder. Hollow organs typically serve more transient functions such as storage and excretion rather than the deep nurturing and storing functions attributed to Yin organs. Understanding this distinction is crucial for grasping concepts related to organ function and overall health in Traditional Chinese Medicine.