What is the meaning of Heoyeol (deficiency heat), how does it differ from having a lot of heat, and what is considered during herbal medicine treatment?

Heoyeol is not a diagnosis of 'having a lot of heat'

Deficiency heatHeoyeol (虛熱) is a Korean medicine term describing a manifestation of heat occurring while the body's foundation is deficient. Here, 'Heo' (deficiency) refers to a state where the power to maintain and recover the body, such as energy (Qi) or blood, is lacking,Jin-aeka state in which the body lacks the strength to maintain and recover itself, while 'Yeol' (heat) refers to burning sensations,Heat sensation in the upper bodydry mouth, or night sweats.

Therefore, Heoyeol is different from simply having a high body temperature or 'having a lot of heat.' It is closer to cases where the body is exhausted and digestion is weak, but the palms and soles feel hot at night; or the face is hot while the abdomen and feet are cold; or heat sensations and night sweats worsen together after sleep becomes shallow. However, a diagnosis of Heoyeol is not made simply because a few symptoms match. Explanation of the term HeoyeolAs such, pattern identification is not a checklist of diagnoses, but a process of reading the current flow of the body to determine the direction of treatment.

Category	Common Presentation	Primary Focus of Treatment
Actual Fever	Body temperature rises, and causes such as infection or inflammation may be identified	The cause of the fever and necessary medical treatment
Excess Heat (Sil-yeol)	Strong sensation of heat, accompanied by prominent thirst, redness, constipation, and restlessness	Focus on releasing excessively accumulated or surging heat
Deficiency Heat (Heo-yeol)	Sensation of heat overlapping with fatigue, dryness, night sweats, and poor recovery	Focus on calming floating heat while replenishing the underlying deficiency

Excess heat and deficiency heat are not simple categories where you choose only one. A person whose bodily fluids and energy have been depleted by long-term illness may experience a temporary strong heat reaction, or they may have a condition where the upper body is hot but the lower body is cold, Upper-body heat and lower-body coldjust as different temperature sensations can appear simultaneously within one body.

There are various causes for burning sensations even when body temperature is normal

A normal thermometer reading means there is no high fever; it does not mean that all causes of the burning sensation have been identified. The direction of the next medical evaluation changes depending on whether the skin is actually red, hot, and increasingly painful; whether the skin temperature is similar but there is a burning or stabbing sensation; or whether general heat, sweating, and palpitations occur together.

• If numbness, diminished sensation, or stabbing pain are present, we examine the peripheral nerves, blood sugar, and nutritional status.
• If redness, actual skin heat, and swelling recur together, we distinguish between skin and vascular reactions.
• If general heat, hand tremors, rapid heart rate, and weight loss overlap, we check thyroid function.
• If changes in menstrual intervals begin alongside facial flushing and night sweats, we also look at menopausal changes.
• If heat sensations and sweating occur after starting a medication or changing the dosage, we check the influence of the medication.

After examining these possibilities, if heat sensations in the hands, feet, or face recur and show a consistent pattern with sleep, digestion, thirst, and energy levels, then heat-cold pattern identification (Han-yeol Byeon-jeung) plays a role. Medical Evaluation Guide for Burning Sensations in Hands and Feetand Medical Evaluation Sequence When Symptoms Persist After Testingwhere you can continue to see the scope of what to check first.

Even for the same type of deficiency heat, herbal medicine prescriptions are not the same

For those who experience burning sensations in the palms and soles at night, dryness in the mouth and throat, and night sweats after falling asleep, the central issue may be a flow where the body cannot hold onto heat due to a deficiency of bodily fluids and yin blood. In such cases, herbal medicine treatment is formulated not just to extinguish the heat, but to replenish the depleted foundation and simultaneously soothe nighttime heat sensations, dryness, and sleep disturbances.

A different prescription is used for those who sweat even with slight movement, feel exhausted after a heat sensation, and have weak appetite and digestion. Since strongly lowering the heat could lead to further exhaustion, the priority is to reinforce energy and support recovery after sweating. If the face and chest feel hot while the abdomen and feet are cold, accompanied by severe bloating after meals, we do not look only at the heat concentrated upward but also regulate digestion in the middle burner and the cold sensation in the lower body.

Baekrokdam Heat-Cold Clinic does not prescribe based on the single term 'deficiency heat.' We examine which deficiency is causing the heat by combining the location and time the heat sensation begins, the combination of sweat, thirst, sleep, digestion, bowel movements, and energy levels, as well as pulse and tongue diagnosis. Herbal medicine treatment regulates the flow of heat surging to one area while restoring the deficient foundation; if tension in the throat and chest or shallow breathing exacerbates the heat sensation, acupuncture treatment is used in conjunction.

Changes in treatment progress are not judged by perceived temperature alone. We also observe whether the nighttime burning sensation decreases to make falling asleep easier, whether there is less exhaustion after sweating, and whether the time it takes for heat sensations to subside after the same daily stimuli becomes shorter. As the body's recovery power improves, the amplitude of temperature sensations can decrease without having to forcibly cool the heat.

Lifestyle management is not about enduring the heat, but about ensuring the treatment remains stable

If your hands and feet feel hot, soaking them in ice water for a long time or seeking only cold foods may provide temporary relief, but it can place other burdens on the skin and digestion. When the skin actually feels hot, it is better to use a cool breeze or a non-freezing pack for a short time, and to first reduce stimuli that clearly increase heat sensations, such as tight shoes, excessive drinking, and spicy foods.

Those whose primary symptom is nighttime heat should reduce hot baths and late-night drinking and keep the bedroom cool. For those with significant fatigue and poor digestion, it is important not to further deplete the body through excessive fasting or strenuous exercise. If sleep and daily life continue to collapse despite long-term lifestyle management, it is not a stage for endurance, but a time to prioritize herbal medicine treatment.

References

• NHS: Symptoms of Erythromelalgia and Safe Cooling
• NHS: Heat sensitivity, sweating, heart rate, and weight changes in hyperthyroidism
• NINDS: Sensory Symptoms and Diagnostic Scope of Peripheral Neuropathy