At 3 AM, all is silent. If you are suddenly startled awake by a violent heartbeat, your chest feeling like it holds a frightened rabbit, thumping so hard it seems about to leap out of your throat—is this merely occasional insomnia, or is the body sending some kind of signal at a specific time? In traditional Chinese medicine (TCM) theory, the Yin hour (3–5 AM) is precisely when the lung meridian is on duty. At this time, qi and blood shift from stillness to movement, and a new cycle of circulation begins with the lung meridian. If the diffusion and dispersion of lung qi is obstructed, or if heart fire takes advantage of the weakness to disturb upward, then palpitations and a severely racing heartbeat easily arise at this hour. This is not mysticism, but rather the subtle resonance between the body's rhythms and the functions of the zang-fu organs.
Why do some people feel cold while others feel hot with the same "pounding heartbeat"?
In clinical practice, although the manifestations of palpitations and a severely racing heartbeat appear similar, the underlying constitutions may be entirely different. A person who stays up late chronically with a flushed complexion, and a person with cold limbs and fatigue, may both describe their heart as "about to jump out," yet the former mostly belongs to yin deficiency with fire hyperactivity, while the latter may have insufficient heart yang. TCM emphasizes "treating the same disease with different methods" precisely because constitutional differences determine different root causes. If one indiscriminately clears heat or warms and tonifies, symptoms may actually worsen.
Constitution A: Yin Deficiency with Fire Hyperactivity—Heart Pounding Like a Drum, Accompanied by Dry Mouth and Tongue
Palpitations in this group tend to worsen in the afternoon or at night. When the heartbeat races severely, it is often accompanied by heat in the palms and soles, dry mouth and throat, night sweats, and dry stools. The tongue body is mostly red with little or peeled coating. When yin is deficient, yang becomes hyperactive, and deficient fire disturbs the heart spirit; the heart feels as if it is being roasted by fire, beating fast and chaotically. These individuals often experience high stress, stay up late frequently, or live long-term in dry, hot environments. Regulation should focus on nourishing yin and descending fire, but the selection of specific foods must be determined by a licensed TCM physician based on individual circumstances. Self-medication is strictly discouraged.
Constitution B: Insufficient Heart Yang—Heart Pounding, Yet Fear of Cold and Fatigue
In sharp contrast to the former is the insufficient heart yang type. Although their heart beats fast during palpitations, it is accompanied by obvious fear of cold, cold hands and feet, shortness of breath, fatigue, and easy sweating. The tongue body is pale and swollen with a white, slippery coating. Yang qi is like the body's "engine"; when power is insufficient, the heart can only maintain blood supply by accelerating its beat. These individuals often have a deficient constitution, or have suffered serious or prolonged illness, or have long lived in cold, damp environments. Their regulation direction is completely different from the yin deficiency with fire hyperactivity type—they need to warm and tonify heart yang, not clear heat.
Constitution C: Phlegm-Fire Disturbing the Heart—Chaotic Heartbeat, Accompanied by Chest Tightness and Excessive Phlegm
There is another pattern that is easily overlooked: palpitations and a severely racing heartbeat accompanied by chest tightness, excessive phlegm, bitter taste in the mouth, and sticky stools. The tongue coating is yellow and greasy, and the pulse is slippery and rapid. This is phlegm-dampness intermingled with fire-heat, obstructing the heart vessels and causing poor movement of qi and blood. These individuals often prefer greasy foods and sweets, or have long-term emotional suppression. They are neither purely deficient nor purely excess, but a mixture of deficiency and excess. If regulated according to yin deficiency or yang deficiency methods, both would fuel the phlegm-fire and make the problem more complex.
Why do the same "palpitations" require opposite treatment approaches?
The core of TCM pattern differentiation lies in "seeking the root." With the same pounding heartbeat, those with yin deficiency need to "replenish water," those with insufficient heart yang need to "add fire," and those with phlegm-fire need to "clear phlegm and descend fire." These three appear contradictory but actually point to the same principle: restoring the balance of the zang-fu organs. In clinical practice, a licensed TCM physician will use inspection, auscultation and olfaction, inquiry, and palpation, comprehensively integrating information from the tongue, pulse, constitutional characteristics, and lifestyle habits to determine the core of the problem. There is no "universal formula" that can address all palpitations.
Waking at the Yin Hour: Is It a "Dialogue" Between the Lungs and the Heart?
Returning to the time-related question from the opening. During the Yin hour, the lung meridian is on duty. If lung qi is congested or lung yin is insufficient, it will affect the normal initiation of qi and blood. The heart governs the blood vessels, and the lungs govern the hundred vessels; the two are closely related. When lung qi is not free-flowing, the heart must work doubly hard to maintain circulation, and thus palpitations and a severely racing heartbeat occur. This reminds us: palpitations are not necessarily only a heart problem—they may also be the lungs' "cry for help." During regulation, one must address both the heart and lungs, rather than focusing solely on the heart.
In acupoint theory, Neiguan (PC6) and Shanzhong (CV17) are often used to explain the mechanisms of chest discomfort when heart-lung qi movement is disrupted. Neiguan belongs to the Hand Jueyin Pericardium Meridian and is the luo-connecting point of the pericardium meridian, one of the eight confluent points, connecting to the yin wei vessel. It is located on the palmar side of the forearm, 2 cun above the wrist crease, between the palmaris longus tendon and the flexor carpi radialis tendon. The Lingshu·Jingmai states: "The separation of the hand jueyin is called Neiguan, located 2 cun from the wrist, emerging between the two tendons." TCM holds that the pericardium receives pathogenic factors on behalf of the heart, so palpitations in the chest and heart are often related to Neiguan. Shanzhong, also known as Yuan'er, belongs to the Ren Mai (Conception Vessel) and is the mu-front point of the pericardium and the hui-meeting point of qi. It is located at the center of the chest, level with the 4th intercostal space, at the midpoint between the two nipples. The Nanjing states: "Qi meets at Shanzhong"—it is where pectoral qi gathers, and the functions of the lungs governing the hundred vessels and the heart governing the blood vessels can all be understood through the movement of qi in the chest.
How to Safely Respond to a "Pounding Heartbeat"?
When facing palpitations, the most important thing is not self-medication, but first clarifying one's constitution. You can observe your accompanying symptoms: Do you fear cold or heat? Is your mouth dry or is there excessive phlegm? Do episodes occur during the day or worsen at night? These details can help a licensed TCM physician make a more accurate judgment. For daily maintenance, those with yin deficiency are suited to moistening foods, those with yang deficiency to warming foods, and those with phlegm-fire to a light diet. However, all regulation must be conducted under professional guidance; never self-prescribe.
In meridian pattern differentiation, Shenmen (HT7) is also frequently mentioned. Shenmen belongs to the Hand Shaoyin Heart Meridian and is the yuan-source point of the heart meridian. It is located at the ulnar end of the distal palmar wrist crease, on the radial side of the flexor carpi ulnaris tendon. Yuan-source points are where the original qi of the zang-fu organs passes through and remains. The Lingshu·Jiuzhen Shier Yuan states: "All these twelve yuan-source points treat diseases of the five zang and six fu organs." The heart stores the spirit, and the name Shenmen ("Spirit Gate") corresponds precisely to the heart spirit. Therefore, when interpreting the TCM mechanisms of palpitations, insomnia, and other spirit-related symptoms, it is often used as an important theoretical node.
What Other "Hidden Signals" Lie Behind Palpitations?
Palpitations and a severely racing heartbeat can sometimes be somatic manifestations of emotional stress. In people with chronic anxiety and tension, liver qi becomes stagnant, and stagnation transforms into fire, which likewise disturbs the heart spirit. These individuals often have hypochondriac distension and pain, frequent sighing, and significant emotional fluctuations. In TCM regulation, treatment often begins with soothing the liver and relieving depression. Additionally, certain chronic wasting diseases and endocrine disorders may also present with palpitations as an initial manifestation. Therefore, if palpitations recur, it is recommended to undergo a comprehensive examination at a proper medical institution to rule out organic disease.
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Frequently Asked Questions
Q: Are "heart panic" and "palpitations" the same thing?
In TCM theory, heart panic often refers to a subjective sensation of accelerated heartbeat and restlessness; palpitations may include tachycardia, bradycardia, or irregular heartbeat. The two overlap, but palpitations have a broader scope. Clinical differentiation requires combining specific manifestations.
Q: Why does eating longan help some people with palpitations but make others feel worse?
Longan is warm in nature and suits those with insufficient heart yang and dual deficiency of qi and blood. If the pattern is yin deficiency with fire hyperactivity or phlegm-fire disturbing the heart, the warming and tonifying nature of longan will fuel the fire and worsen the palpitations. This precisely demonstrates the importance of pattern differentiation.
Q: Is there a safe emergency method when palpitations occur?
You can try slow, deep breathing or gentle acupressure. However, these methods only provide temporary relief and cannot replace professional pattern-based regulation.
Q: Can TCM help with long-term palpitations when examinations show no abnormalities?
TCM focuses on addressing functional problems. Normal examination results do not mean there is no imbalance. By adjusting constitution and balancing qi and blood, many palpitation symptoms can be alleviated. But the prerequisite is identifying the correct cause.