What are the functions of the Spleen and Stomach in Chinese Medicine?

In Chinese Medicine, the Stomach receives, holds and begins processing food and fluids, while the Spleen transforms, makes use of and distributes their nourishing parts. Together, these systems form a Zang-Fu pair that is central to the daily production of Qi and Blood and to nourishing the body.

In this article, you will understand how the Spleen and Stomach are defined, what transportation, transformation, raising the clear and descending the turbid mean, as well as the Spleen's relationships with Blood, muscles, limbs, mouth, lips, thought and Yi.

Continue reading to learn about the functions attributed to each system and understand how their complementary movements sustain the reception, use and distribution of the resources obtained through food.

How are the Spleen and Stomach understood in Chinese Medicine?

In Traditional Chinese Medicine, the Spleen and Stomach are functional systems related to the reception, transformation and use of food and fluids. The Spleen belongs to the Zang organs, while the Stomach belongs to the Fu bowels. Together, they form an interior-exterior pair within the Zang-Fu organization.

These systems do not correspond only to the spleen and stomach of modern anatomy. The traditional Spleen encompasses activities related to nutrition, fluids, Blood, muscles and thought. The Stomach primarily represents the capacity to receive, temporarily hold, break down and move onward the contents that have been ingested.

Their functions complement one another. The Stomach receives and begins processing food, while the Spleen uses and distributes the parts considered nourishing. For this reason, this pair occupies a central place in the way Chinese Medicine understands the daily acquisition of the resources needed for the body to function.

What does it mean for the Spleen to govern transportation and transformation?

Governing transportation and transformation is the main function attributed to the Spleen. Transformation means modifying the food and fluids received by the body so that their usable parts can be identified. Transportation means distributing these resources to other regions and systems that depend on them.

This function also involves ingested fluids. The Spleen participates in separating, using and distributing water, helping direct it to the appropriate places. Transportation and transformation therefore encompass both the nourishing components of food and the functional movement of fluids.

The expression should not be considered a direct translation of digestion or metabolism. Although there are similarities, the Spleen of Chinese Medicine encompasses processes that biomedicine distributes among different organs and systems. It is a traditional category used to organize several stages in the use and distribution of food.

How does the Spleen participate in the formation of Qi and Blood?

After food and drink have been received, the Spleen participates in extracting and distributing their nourishing parts. These resources form the acquired basis used by the body to sustain its activities. Within traditional theory, they contribute to the continuous formation of Qi and Blood.

For this reason, the Spleen is called the postnatal foundation. The expression indicates that, after birth, the daily maintenance of vitality depends on making use of food and fluids. The original constitution remains important, but it must be sustained by resources obtained each day.

Saying that the Spleen participates in the production of Qi and Blood does not mean that the anatomical spleen produces these substances on its own. The statement belongs to the physiology of Chinese Medicine and describes a functional network involving digestion, absorption, distribution and the transformation of nourishing components.

What does it mean for the Spleen to raise the clear?

Chinese Medicine states that Spleen Qi has an upward movement. It conducts the nourishing parts obtained from food and fluids upward, distributing them mainly toward the Heart and Lung. This movement is known as raising the clear or the ascent of nutrients.

In this context, “clear” does not merely mean transparent. The word indicates the parts regarded as pure, useful and nourishing, as opposed to waste that must continue descending through the digestive system. The Spleen raises what will be used, while other functions conduct unused components toward elimination.

The raising of Spleen Qi is also related to supporting the internal structures. World Health Organization terminology associates this function with maintaining the normal position of the organs. This idea belongs to the Chinese functional model and does not represent an isolated anatomical explanation for displacement or prolapse.

What does it mean for the Spleen to keep Blood within the vessels?

Another traditional function of the Spleen is to contain or govern Blood. This means that its Qi participates in keeping Blood within the vessels, preventing it from leaving the pathways through which it should circulate. The function involves containment and stability, not the storage of a reserve of blood.

This role differs from moving Blood, which is related primarily to the Heart, and from storing it, which is associated with the Liver. In the Spleen's case, the focus is its ability to keep circulation organized within the vessels, showing that each system participates in this process in a different way.

In traditional assessment, bleeding may be analyzed in relation to this function when it appears together with other manifestations consistent with a Spleen pattern. However, the presence of bleeding does not confirm this pattern by itself and requires medical investigation to identify its origin and severity.

What is the Spleen's relationship with the muscles, limbs, mouth and lips?

The Spleen governs the muscles and the four limbs because it participates in distributing the nourishing components that sustain their activities. From this perspective, strength, movement and muscular endurance depend on receiving these resources adequately. The relationship primarily involves functional nourishment, not direct neurological control of the muscles.

The arms and legs are emphasized because they express the body's ability to convert food into usable resources. The disposition to walk, work and move is observed alongside the general condition of the muscles. Weakness or a feeling of heaviness, however, acquires meaning only when analyzed with the other signs presented.

Chinese Medicine also states that the Spleen opens into the mouth and manifests in the lips. Taste, appetite, appearance, color and moisture of the lips may be observed during assessment. These correspondences do not mean that every change in the mouth or lips originates in the Spleen.

How is the Spleen related to thought and Yi?

The Spleen stores Yi, a term generally translated as intention, idea or the capacity to direct thought. Yi participates in concentration, reflection, study and the mental organization needed to understand and work with information. It represents a specific function and does not correspond to the mind in its entirety.

This association draws a parallel between transforming food and elaborating ideas. Just as the Spleen selects and distributes nourishing components, Yi allows information to be received, analyzed and transformed into understanding. It is a traditional correspondence used to express the integration between bodily and mental activity.

The emotion related to the Spleen is excessive thinking, also translated as worry or rumination. Thinking is not considered harmful in itself. The relationship becomes relevant when mental activity remains repetitive, intense and difficult to interrupt, interfering with rest, attention and everyday activities.

What are the main functions of the Stomach?

The Stomach governs the reception and temporary holding of food and drink. It receives what arrives through eating and keeps it during the initial stage of processing. As a Fu bowel, it needs to fill, transform the contents received and then send them on to the following stages.

Another function of the Stomach is to decompose or ripen food. This expression describes the beginning of the transformation of ingested contents before they proceed to the Small Intestine. The Stomach prepares the material that will later be separated into usable components and waste.

Its operation also depends on sufficient moisture. The theory states that the Stomach prefers softness and moistening because its processes need Yin fluids. This does not mean that drinking water is enough to correct any gastric change, but describes a functional condition attributed to the system.

Why does Stomach Qi need to descend?

The normal movement of Stomach Qi is downward. After receiving and decomposing food, the system must conduct the initially processed contents toward the Small Intestine. This descent maintains continuity among reception, transformation, separation and elimination.

The expression “descending the turbid” indicates moving onward contents that still need to be processed or eliminated. Turbid does not necessarily mean dirty or harmful, but rather what will not be raised as a nourishing part. The Stomach conducts this material downward, while the Spleen distributes the clear upward.

When the downward movement is described as reversed, manifestations such as nausea, vomiting, hiccups or belching may be related to rebellious Stomach Qi. These symptoms, however, have many possible causes and should not be interpreted exclusively through Chinese Medicine.

How do the Spleen and Stomach work together?

The Spleen and Stomach operate as two complementary movements. The Stomach receives, temporarily holds and conducts contents downward. The Spleen transforms, makes use of and distributes the nourishing components upward. This combination creates a circulation among reception, descent, extraction and ascent.

The function of each system depends on the other. The Spleen cannot transform what has not been received and prepared by the Stomach, while the Stomach depends on the Spleen's activity for usable parts to be distributed. Harmony between ascent and descent maintains continuity in the process.

This partnership explains why the Spleen-Stomach pair is called the postnatal foundation and the source of acquired nourishment. It is a traditional model, not a direct equivalence with biomedical organs or processes. Persistent digestive symptoms, weight loss, bleeding, vomiting or severe pain require appropriate medical assessment.

About the author

Prof. Tibério Z has more than 30 years of experience teaching spirituality, metaphysics, holistic therapies and consciousness development.