Painful Periods

A hopeful starting point

If your cramps fit the picture of primary dysmenorrhea—period pain without a known pelvic disorder—Xiao Yao Wan and Dang Gui Shao Yao San are two classic formulas often discussed in East Asian medicine, especially when pain comes with bloating, mood strain, fatigue, or a sense of being “stuck.” Recent evidence suggests herbal approaches for primary dysmenorrhea may reduce pain and, in some studies, perform similarly to common medications, although the overall certainty of evidence is still low and stronger trials are needed. 

Where Xiao Yao Wan shines

Xiao Yao Wan, and its close relative Jiawei Xiao Yao, is traditionally chosen when cramps come with bloating, irritability, anxiety, sighing, and emotional tension—what TCM describes as liver–spleen disharmony with qi stagnation. Official labeling includes dysmenorrhea, menstrual irregularity, anxiety/irritation, fatigue, and insomnia; a 2024 randomized trial of Jiawei Xiaoyao pill (great for peri-menopausal and menopausal women) also found improvement in PMS-related psychological and somatic symptoms compared with placebo. 

Where Dang Gui Shao Yao San fits

Dang Gui Shao Yao San is often used when pain comes with heaviness, dizziness, pallor, lower-body coldness, or fluid retention. In simple TCM language, it helps nourish blood, support the spleen, move stagnation, and drain dampness. Official labeling includes dysmenorrhea, menstrual irregularity, anemia, malaise, and headache/dizziness, and a 2020 systematic review concluded it may help primary dysmenorrhea. 

Safety and when to get checked

These formulas are commonly sold as pills or granules, but ingredients and strengths vary, so dosing should be individualized by a qualified clinician. Because herbal products can interact with medicines, and supplements in pregnancy and breastfeeding, get professional guidance first—especially if you are pregnant, trying to conceive, breastfeeding, or taking prescription drugs.  

Practical takeaway

A simple rule of thumb: think Xiao Yao Wan for pain plus bloating and mood tension, and Dang Gui Shao Yao San for pain plus heaviness, dizziness, coldness, or fluid retention—always matched to the whole person, not just the period. Medical note: if symptoms are intense, new, or changing, please ask a qualified clinician to confirm the diagnosis and guide safe treatment. (Tong Jing Wan for young women with clotting.)