Cold, Heat, Dampness, Phlegm: Common TCM Terms Explained

Cold

Cold syndrome is described as susceptibility and aversion to cold, and is typically seen in people with a yang-deficient constitution. [3] In rheumatoid arthritis, a "cold pattern" is described as joint pain eased by warmth and made worse by cold. [4] One research paper lists intolerance to cold and loose or watery stools among features of the related "yin-cold" type, and says not every listed sign is needed. [5]

What studies found: in 20 women with rheumatoid arthritis (ten with a cold pattern, ten with a heat pattern), blood cells showed different gene activity. [4] In 283 adults, yang deficiency and cold syndrome went with lower energy metabolism in white blood cells. [3] In 954 people assessed with Korean medicine, a cold-pattern score was linked to a lower resting metabolic rate. [6] These are small, observational findings. Label: insufficient evidence for any use in care.

Heat

A "heat pattern" in the same arthritis paper is severe pain with hot, red, swollen, inflamed joints, eased by cold. [4] The same paper lists fever, thirst and a flushed face among other signs. [4] A hot, red, swollen joint or a fever needs medical assessment first.

Heatiness (shang huo) and "hot body"

People sometimes describe feeling "heaty" (shang huo) or having a "hot body." A scoring scheme for it was built from 121 patients at hospitals in Guangdong. [7] Scores were negatively correlated with one saliva marker (secretory IgA) but not with three others. [7] Tradition calls durian a "heaty" food, believed to raise body temperature and blood pressure. [8] See warming and cooling foods for what that study found. Label: traditional use only; insufficient evidence.

Dampness

Dampness may come from a humid environment (external dampness) or from internal metabolic imbalance. [9] It is described as showing up as body heaviness, limb soreness, abdominal bloating or diarrhea, and poor appetite and digestion. [10] Its onset is said to be slow and hidden, with mild early symptoms. [10]

What studies found: a 2025 study of 250 people looked for blood markers; it linked patterns such as heavy head and limbs, sticky mouth and greasy tongue coating to molecular pathways. [1] A rating scale was tested in 869 people against a clinician's own dampness diagnosis, so it measures agreement with the tradition, not an outside standard. [10] One review concludes modern science has not yet established a clear understanding of dampness. [9] Label: preclinical and exploratory; insufficient evidence.

Heaviness, poor digestion and diarrhea have many medical causes. See digestive symptoms: when to get help.

Phlegm

In TCM, phlegm is not only mucus. It is defined as a viscous, turbid pathological product that can build up in the body. [11] There is a narrow sense (visible phlegm such as nasal discharge or sputum) and a broad sense that includes "invisible" phlegm. [11]

Urgent safety note. In one paper, a phlegm pattern in coronary artery disease is described as choking or crushing chest discomfort with shortness of breath, which the authors say resembles typical angina. [11] Chest pain that feels tight or squeezing, or spreads to the arm, neck or jaw, can be a heart attack. [12] In the United States call 911. Do not treat it as phlegm.

What studies found: a meta-analysis of 30 studies (5,055 people with coronary artery disease) found phlegm syndrome was linked to multivessel disease (odds ratio 1.53). [11] That is an association based on practitioner labels. A 2026 review of phlegm-dampness in vertigo cautions that theory does not by itself give clinical evidence, and that the proposed abnormalities have not been shown to occur together in patients with that pattern. [13] Label: association only.

Damp-heat and combined patterns

Patterns often combine terms. In 400 people with functional dyspepsia, "cold-heat complex" was the most common pattern in Hong Kong (59.8%) and "spleen-stomach dampness-heat" the most common in Hunan (77.1%). [14] Between 52.7% and 59.6% of participants got two or more patterns. [14] The authors say no standards exist to ensure practitioners agree. [14]

At a glance

Reading these terms safely

Practitioners judge these terms using questions and examination, and agreement between them varies (see Common TCM Patterns and tongue and pulse assessment). Do not pick herbs or foods from these words; see Chinese herbal product quality and interactions. Fever, a hot swollen joint, chest pain or lasting diarrhea need a doctor first.