What allows our Heart’s light to be known

Coda: the Pericardium in Chinese Medicine

TCM Deep Dives is a series of ongoing explorations of Traditional Chinese Medicine—bridging physiology, emotion, and spirit.

If you’re new to this series, I recommend beginning with the introduction, followed by the Spleen, the Lung, the Kidneys, the Liver, and the Heart.

Dearest Reader,

As we brought our six-week series on the zang organs to a close last Friday, a reader asked a beautiful question:

What does Chinese Medicine say about grief surfacing? When the heart opens up and old grief stuffed inside comes tumbling out?

It felt fitting to end here, with this.

I’m sharing my response as a kind of coda to the series, and as a bridge into the next one on the seven emotions, which begins next Friday.

Here’s my response, expanded with a bit more context.

There are different ways I might answer this within TCM, but one involves a zang organ that I didn’t cover directly in this series, which was originally considered together with the Heart zang: Xin Bao ⼼包—the Pericardium.

Xin Bao ⼼包 might be translated as the Heart’s wrapper or envelope.¹

Oftentimes, when something painful or difficult happens to us, that layer protecting the Heart becomes stronger and less permeable, almost as a way of saying, “that’s never happening to me again.”

Heartbreak, loss, trauma—the pain of humanness—all can lead us, quite naturally, to build up that wall.

It’s also common for people’s Pericardiums to bump up against each other, wall-to-wall—instead of connecting heart-to-heart.²

But then other things might happen—whether through conscious practices or simply in response to life—that cause that layer to soften or open. When that occurs, we might feel grief that’s been held there, in the Heart, beneath the surface.

As with all emotions, grief in TCM is a movement of Qi. It wants to be felt and move through us. With feeling and movement, it transforms and releases.

I see grief as an expression of love, and as one of the most immediate and fullest ways we open to it. In grief, love rises to the surface of our experience.

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Xin Bao ⼼包 is intimately connected to the Heart and is said to share in its functions, yet it also carries a distinct role—first as the Heart’s protector.

As we saw in our exploration of the Heart, the shen 神—the heart-mind-spirit-consciousness—rests there. But neither the Heart nor the shen is fully exposed. They are held and protected.

In the classical texts, the Heart is understood as so vital that it must be shielded from direct invasion. When something that acts against life arises—what we call Xie Qi 邪气—this layer stands in the way, receiving what the Heart itself cannot bear.

Xin Bao is also described as the Heart’s envoy, moving on its behalf and carrying communication between inner and outer, between self and other.

It shapes how we meet the world, and how the world meets us. It influences our capacity for intimacy, connection, and relationship, how open or guarded we are, and how we allow ourselves to be known.

Through this role, it participates in the housing and expression of the shen. It is a place through which the shen ming 神明, the brightness of spirit, enters and exits. It is considered the source of happiness and laughter, joy and elation.

It is also considered a reservoir of Qi in the chest, and reflects the influence of the Ming Men fire we explored in the Kidneys.

A classical image brings this together: we cannot look directly at the sun—the Heart. But its rays, the Xin Bao, illuminate our world. We come to know the Heart, and others, through this illumination.

Xin Bao, then, is not only what protects the Heart, but what allows its light to be known.

Over these past weeks, we’ve traced how life moves through us—through nourishment, breath, essence, and flow—until it is known and lived in the Heart.

With the Xin Bao, we touch the threshold between protection and openness, between holding and feeling.

And it is here that the emotions begin to reveal themselves—through the body, through feeling, through movement. That’s where we’ll continue next Friday.

If something resonated or stirred a question, I’d love to hear from you. Feel free to share in the comments.

With love,
Dana

With gratitude, I write from within a lineage of Chinese Medicine that I have been privileged to study through dedicated, masterful teachers. What I share here is shaped by years of study, practice, and transmission within a living tradition. I am especially grateful to my primary teacher in this medicine, 伦华.

Disclaimer: While I am a licensed Doctor of Traditional Chinese Medicine, this newsletter is educational and not a substitute for individualized medical care. I cannot provide personal medical or dietary advice without a full clinical intake and informed consent. If you’d like to explore one-on-one work with me, you can reply to this email or contact me at hello AT danaleighlyons DOT com.

1. As Nigel Wiseman and Zhang Yuhuan explain: “The idea of ‘envelop’ is essential to understanding this character. It is the original character for 胞 bao, the placenta. The new character, 胞 bao, composed with the flesh signific, ⺼ rou, was invented in order to isolate this specific meaning from its extended meanings such as to contain, harbor, or wrap.” (Chinese Medical Characters, Volume 1: Basic Vocabulary, p. 138)

2. My partner Dr. Randal Lyons, Doctor of TCM, has explored these dynamics extensively in the context of addiction.