BL55 (Heyang, “Meeting of Yang”) is an acupuncture point on the Bladder Meridian. It is located on the posterior aspect of the lower leg, 2 cun directly inferior to the midpoint of the popliteal crease (BL40), on the line connecting BL40 and BL57. It strengthens the lumbar spine and knees, resolves Dampness, regulates the Lower Jiao, and alleviates pain.
On the posterior aspect of the lower leg, 2 cun directly inferior to the midpoint of the popliteal crease (BL40), on the line connecting BL40 and BL57.
Perpendicular insertion, 1.0 to 1.5 cun.
Strengthens the lumbar spine and knees, resolves Dampness, regulates the Lower Jiao, and alleviates pain.
Lumbar and spinal pain, lumbar and spinal stiffness, pain radiating to the abdomen, difficulty walking, heaviness in the thigh and knee, cold hernia, unilateral scrotal pain, uterine bleeding, abnormal vaginal discharge, epilepsy without frothing at the mouth, heel pain, thigh and buttock cold and pain, leg and foot weakness, knee and thigh heaviness, uterine bleeding and abnormal discharge in women, uterine bleeding with abdominal and intestinal pain, inguinal heat, knee and shin soreness and heaviness, knee and shin coldness and pain, inguinal swelling and pain, cold hernia with unilateral pain.
Heyang is a crucial distal point for acute and chronic lower back pain, especially when there is stiffness, pain radiating down the leg, or a sensation of cold. Its location between Weizhong (BL40) and Chengshan (BL57) makes it effective for treating the entire posterior chain of the leg, from the gluteus to the heel. The classical indications also highlight its utility for urogenital issues like hernias and uterine bleeding, suggesting it regulates Qi and Blood in the Lower Jiao.
Classical text; the translation was prepared with AI and is not clinical advice.
《針方六集》 Zhēnfāng Liùjí — Six Collections on Needling, Wu Kun, 1618 · 卷之五·紛署集 · 足太陽及股並陽蹻六穴凡三十六穴第三十四 · Source: jicheng.tw ↗
合陽二穴，治腰脊強痛引腹，陰股熱，胻酸腫，不能行立，寒疝偏墜，痔瘻，女子血崩帶下The text records that BL55 was used for stiff, painful lower back and spine radiating to the abdomen, heat of the inner thigh, aching and swollen shins with inability to walk or stand, cold hernia with one-sided descent, haemorrhoids and fistulas, and in women uterine bleeding and vaginal discharge.
《類經圖翼》 Lèijīng Túyì — Illustrated Wings to the Classified Canon, Zhang Jiebin, 1624 · 卷七 · 經絡（五） · 足太陽膀胱經穴 · Source: jicheng.tw ↗
合陽 在膝膕約文下二寸。 刺六分，灸五壯。 主治腰脊強，引腹痛，陰股熱，胻酸腫，寒疝偏墜，女子崩帶不止According to this text, BL55 lies 2 cun below the crease of the back of the knee; it records needling 0.6 cun and 5 moxa cones, with use for stiff lower back radiating to the abdomen, heat of the inner thigh, aching swollen shins, cold hernia and persistent uterine bleeding and discharge.
《針灸甲乙經》 Zhēnjiǔ Jiǎyǐ Jīng — Systematic Classic of Acupuncture & Moxibustion, c. 256–282 · 卷08 · Source: Wikisource ↗
跟厥膝急，腰脊痛引腹，篡陰股熱，陰暴痛，寒熱膝酸重，合陽主之The text records that BL55 was used for heel-reversal (jue) with tight knees, lumbar and spinal pain radiating to the abdomen, heat in the perineum and inner thigh, sudden genital pain, and chills and fever with aching, heavy knees.
BL55 is one of 67 points on the Bladder Meridian. Nearby points:
BL55 (Heyang) is located on the posterior aspect of the lower leg, 2 cun directly inferior to the midpoint of the popliteal crease (BL40), on the line connecting BL40 and BL57.
BL55 strengthens the lumbar spine and knees, resolves Dampness, regulates the Lower Jiao, and alleviates pain. Common clinical indications include lumbar and spinal pain, lumbar and spinal stiffness, pain radiating to the abdomen, difficulty walking, heaviness in the thigh and knee, cold hernia, unilateral scrotal pain, uterine bleeding, abnormal vaginal discharge, epilepsy without frothing at the mouth, heel pain, thigh and buttock cold and pain, leg and foot weakness, knee and thigh heaviness, uterine bleeding and abnormal discharge in women, uterine bleeding with abdominal and intestinal pain, inguinal heat, knee and shin soreness and heaviness, knee and shin coldness and pain, inguinal swelling and pain, cold hernia with unilateral pain.
Perpendicular insertion, 1.0 to 1.5 cun.
BL55 is a point on the Bladder Meridian (Zú Tài Yáng Páng Guāng Jīng).