Camphor

Traditional Use

Primary Actions

• Opens the orifices and dispels turbidity - historically used in tiny supervised doses for fainting, heatstroke, and sudden collapse when foul turbidity clouds the sensory openings.
• Kills parasites and stops itching - the most common traditional use today, especially topically for scabies, ringworm, and intensely itchy skin lesions.
• Reduces swelling and alleviates pain - applied to sprains, bruises, toothache, insect bites, and cold-type painful lesions that benefit from aromatic penetration and local counterirritation.
• Warms the middle and relieves sudden abdominal pain - a smaller historical internal use for cold-damp or foul summer complaints with cramping, vomiting, and diarrhea.

Secondary Actions

• Zhang Nao is mostly an external-use aromatic now because its toxic window is much narrower than the cooler and more clinically flexible borneol lineage.
• It must not be decocted because the volatile aromatic compound would be lost and uncontrolled oral exposure is unsafe.

Classic Formulas

• Zhang Nao with Liu Huang - classic antiparasitic topical pairing for scabies, ringworm, and stubborn itchy fungal lesions.
• Zhang Nao with Ru Xiang - pain-relieving topical combination for trauma, swelling, and local stagnation.
• Zhang Nao with Xiong Huang - stronger toxic-dispersing external strategy for chronic ulcerated or stubborn skin lesions.

Classical References

• Me & Qi classifies Zhang Nao as a hot, acrid aromatic derived product that opens the orifices, kills parasites, stops itching, and relieves pain, with modern use focused mainly on topical application.
• The same source repeatedly contrasts camphor with Bing Pian: Zhang Nao is hotter, harsher, and more toxic, while Bing Pian is cooler and preferred for inflamed heat conditions.
• IDENTITY NOTE: medicinal camphor should not be confused with naphthalene mothballs or casually substituted with synthetic household products.