Knowledge Base/Herbs/Japanese Climbing Fern Spores
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利水渗湿药（利尿通淋） · Damp-draining; strangury-relieving

Japanese Climbing Fern Spores hǎi jīn shā · 海金沙

Lygodii Spora (Lygodium japonicum (Thunb.) Sw.)

Nature and flavour. Sweet, salty, cold; Bladder and Small Intestine systems.

The drug is the spore of a climbing fern, not the leaf. Classically described as promoting urination, relieving strangury and easing pain; the classical texts use it particularly for the pattern they call stone strangury, where gravel or stones are held to obstruct the urinary tract, and for the griping pain said to accompany it.

性味归经。甘、咸，寒；归膀胱、小肠经。

用药部位是攀援蕨类的孢子，不是叶片。传统记载为利尿通淋、止痛，古籍尤多用于「石淋」—— 即认为砂石阻塞尿路所致的淋证，以及伴随的绞痛。

Classical category · no formulas, no dosages, no herb-drug combinations are given.
Safety. Cold in nature; classically avoided where there is no damp-heat and in cold deficiency of the Spleen and Stomach. Avoid in pregnancy and breastfeeding — reliable human safety data are lacking. Confirmed urinary stones, blood in the urine, or pain with fever are matters for medical investigation; this entry does not claim the herb dissolves stones, and that claim is not established by reliable human evidence.

性寒，传统列为无湿热及脾胃虚寒者不宜。孕期与哺乳期避免使用 —— 人体安全性数据不充分。已确诊的尿路结石、尿血或伴发热的疼痛应当就医检查；本条目不宣称该药能溶石，此说法未被可靠的人体证据证实。

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