About This Herb*
Traditional Chinese Medicine background and properties
Herb Description*
Jiang Can is the dried body of a silkworm larva that has been naturally infected by a white fungus (Beauveria bassiana). It is widely used in Chinese medicine to calm spasms and tremors, relieve headaches and skin itching caused by Wind, and dissolve Phlegm-related lumps and swellings such as swollen lymph nodes or mumps. It has a mild, neutral nature, making it suitable for a broad range of conditions.
Herb Category*
Main Actions*
- Extinguishes Wind and Stops Spasms
- Dispels Wind and Stops Pain
- Transforms Phlegm and Dissipates Nodules
- Clears Heat from the Throat
How These Actions Work*
'Extinguishes Wind and stops spasms' means Jiang Can calms internal Liver Wind that causes involuntary muscle movements such as tremors, twitching, and convulsions. Because its nature is neutral (neither hot nor cold), it can be used for spasms regardless of whether the underlying cause is Heat or Cold. It is particularly suited to cases where Phlegm and Wind combine to cause seizures or convulsions, such as childhood febrile convulsions, epilepsy, or tetanus.
'Dispels Wind and relieves pain' refers to its ability to expel Wind from the channels and collaterals of the head and face. This makes it effective for wind-related headaches (including migraine), facial pain, toothache caused by Wind invasion, and itchy skin rashes like hives. Wind in TCM is an agitating pathogenic factor associated with sudden onset, movement, and change.
'Transforms Phlegm and dissipates nodules' describes how Jiang Can breaks up Phlegm accumulations that form lumps or swellings in the body. This applies to conditions like scrofula (swollen lymph nodes), mumps (parotid gland swelling), thyroid nodules, and phlegm-related throat obstruction. Its salty taste in TCM theory softens hardness and dissolves masses.
'Clears Heat and resolves toxins from the throat' means Jiang Can can address sore throat, throat swelling, and voice loss caused by Wind-Heat or toxic Heat affecting the throat. It is a commonly used herb in formulas for acute pharyngitis and tonsillitis.
Patterns Addressed*
In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Jiang Can is traditionally associated with these specific patterns.
The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.
Why Jiang Can addresses this pattern
When extreme Heat stirs up internal Liver Wind, the result is high fever with convulsions, muscle spasms, or seizures. Jiang Can enters the Liver channel and directly extinguishes Wind to stop spasms. Its neutral temperature means it does not add more Heat, and its Phlegm-transforming action addresses the Phlegm that commonly accompanies Wind in this pattern. It is often combined with stronger Wind-extinguishing herbs like Gou Teng (Uncaria) or Tian Ma (Gastrodia) for severe cases.
A practitioner would look for one or more of these signs
Febrile convulsions, especially in children
Involuntary muscle twitching or rigidity
Seizures with phlegm-related symptoms such as drooling or gurgling
Why Jiang Can addresses this pattern
When Wind and Phlegm combine and lodge in the channels of the head and face, they block the flow of Qi and Blood, causing sudden facial paralysis (mouth and eye deviation) or numbness. Jiang Can's acrid taste disperses Wind and opens the channels, while its salty taste softens and dissolves Phlegm accumulations in the network vessels. It enters the Liver and Stomach channels, which govern the sinews and the face respectively, making it particularly suited for this head-and-face pattern.
A practitioner would look for one or more of these signs
Sudden deviation of mouth and eye, Bell's palsy
Numbness or heaviness in the face
Recurrent headache due to Wind-Phlegm
Why Jiang Can addresses this pattern
External Wind-Heat can invade the Lung channel, affecting the throat and skin. Jiang Can enters the Lung channel and uses its acrid dispersing nature to vent Wind-Heat outward from the body surface. It addresses sore throat by clearing Heat from the throat area and can relieve itchy skin rashes (wind rash or urticaria) by expelling Wind from the skin. Its Phlegm-transforming action also helps when phlegm congestion accompanies the sore throat.
A practitioner would look for one or more of these signs
Acute sore throat with redness and swelling
Itchy skin rashes and hives from Wind-Heat
Eye redness and irritation due to Wind-Heat
Why Jiang Can addresses this pattern
When Phlegm and Heat congeal together, they can form palpable lumps and swellings, particularly in the neck region (lymph nodes, thyroid, parotid glands). Jiang Can's salty taste softens hardness and its Phlegm-transforming action breaks down these accumulations. Its ability to enter the Stomach channel (the Stomach channel traverses the neck and jaw area) makes it especially effective for lumps along this pathway, such as mumps and scrofula.
A practitioner would look for one or more of these signs
Swollen lymph nodes in the neck (scrofula)
Parotid gland swelling and pain
Phlegm-related lumps in the throat area
TCM Properties*
Neutral
Acrid / Pungent (辛 xīn), Salty (咸 xián)
Animal — whole (全虫 quán chóng)
This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.