Licorice root and Cough: The Traditional Reasoning, Plus the Evidence

If you have read about cough and Chinese medicine, Licorice root was probably in the list. This article narrows it down: why the tradition uses it here, what evidence exists, and how to actually take it.

In pattern terms, this is about wind-cold cough with clear, watery phlegm and chills. Licorice root (Gan Cao, 甘草) is neutral in nature and enters the all twelve meridians, which is the classical reason it suits that picture.

Classically, it moistens the lung and relieves dry cough and sore throat. A practitioner matching your tongue and pulse to that pattern is exactly the situation it was chosen for.

The evidence for Licorice root

This is where the research is most active: licorice mouth rinse or gargle might reduce ulcer size and pain in people with recurrent canker sores, while topical licorice might reduce ulcer size only. In one study, using a licorice extract in combination with a medicine to treat canker sores was more effective than using the medicine alone.

How people take it for cough

Simmer 2 to 10 grams of sliced root with other herbs, or add a few slivers to throat-soothing teas.

Acupressure runs alongside the herbs in most treatment plans. The points most often paired with this pattern are tiantu, lieque, and pressing them firmly for a minute at a time is easy to learn.

For the fuller picture, including the other patterns behind cough, see the Cough guide.

Cautions

A few cautions from the research literature: interactions between licorice and corticosteroids have been reported.

Herbs work best as part of a pattern, not as a solo act. If your symptoms keep coming back, that is the moment to get a proper TCM diagnosis rather than to keep self-prescribing.