Every herb has a profile

Chinese medicine does not describe a herb by its chemistry but by how it behaves in the body — its energetic profile. Learn to read this profile and you can predict what a herb does before memorising it. Every entry in the materia medica gives five things.

1. The four natures (si qi)

The herb's thermal quality: hot, warm, neutral, cool, or cold. This is the single most important attribute. Warm and hot herbs add yang and dispel cold; cool and cold herbs clear heat and drain fire. You match the herb's nature against the pattern: cold patterns need warm herbs, heat patterns need cool herbs. Getting this backwards is the commonest and most harmful error.

2. The five tastes (wu wei)

Taste describes action, not just flavour:

  • Acrid/pungent — disperses and moves (releases the exterior, moves qi and blood).
  • Sweet — tonifies, harmonises, moderates (most tonics are sweet).
  • Bitter — drains and dries (drains fire downward, dries damp).
  • Sour — astringes and consolidates (holds in leakage — sweat, urine, essence).
  • Salty — softens hardness and drains downward (softens masses, moves the bowel).
  • (Bland — a minor taste that drains dampness through urination.)

A herb often has two or three tastes, which together sketch its actions.

3. Channels entered (gui jing)

Which channels and organs the herb "homes to" and acts upon. A cough herb that enters the Lung, a headache herb that enters the Liver and Gallbladder — the channels tell you where the herb's nature and taste will work. This is how the same cooling action is directed to the Lung by one herb and to the Liver by another.

4. Functions and indications

The herb's specific actions in TCM terms (e.g. "clears Lung heat, transforms phlegm, stops cough") and the patterns and symptoms it treats. Functions are the practical heart of the entry — they translate nature/taste/channel into clinical use.

5. Dosage and cautions

The usual dose range (in decoction), and the contraindications and cautions — pregnancy, incompatibilities, toxicity, and patterns the herb must not be used in. This lesson's companion, the next, covers preparation and safety in full.

Reading it all together

Take a herb described as acrid, warm; enters Lung and Bladder; releases the exterior, promotes sweating. From the profile alone you know: it is for a cold exterior pattern (warm), it disperses outward (acrid), it works on the surface and Lung (channels), by making the person sweat out a wind-cold. The profile is the herb.

Nature, taste, channel, function, dose. Master this five-part reading and the entire materia medica becomes legible — not a list to memorise, but a logic to apply.