# Why Your Grandmother's Castor Oil Pack Actually Works for Your Cramps
Your grandmother wasn't just making you feel better—she was practicing a form of medicine that neuroscience is finally catching up to.
There's a particular kind of knowing that gets passed down through women's bodies across generations. My own grandmother used to wrap warm castor oil across my lower belly in strips of soft cloth when cramps had me folded in half on the kitchen floor. No explanation. Just: "Sit still, mija. This works." I spent my twenties thinking it was placebo, the way we sometimes dismiss the remedies that came before the internet had opinions about them. Then I read the research, and I had to apologize to every woman in my family line who knew something we're only now learning how to measure.
The ancestral menstrual remedies your grandmother used—whether castor oil packs, herbal teas, belly massage, or heat—weren't folk magic. They were sophisticated applications of what modern medicine calls anti-inflammatory and antispasmodic therapy. And for women of color especially, understanding why these work matters. It's not just about reclaiming what was effective; it's about recognizing that traditional medicine systems kept your ancestors functional and fertile and alive when Western medicine either wasn't available or actively harmed them.
Why this matters for us
Period pain affects Black women, Latina women, and Asian women differently than white women—not because our bodies are inherently different, but because we experience different barriers to treatment, different rates of diagnosis, and often, different cultural inheritances around managing menstrual health.
Black women are less likely to be believed when we report period pain. We're more likely to be diagnosed with fibroids or PCOS late. Latina women often manage dysmenorrhea without diagnosis or treatment, shouldering the pain as something that just is. And across communities of color, we have these grandmother remedies—curanderismo, Ayurvedic practices, traditional Chinese medicine approaches, Nigerian and Caribbean herbal protocols—that actually work, but we've been taught to think of them as quaint or inferior to what a white coat prescribes.
The castor oil pack is a specific case study in this. It's been used in Ayurvedic medicine for thousands of years, appears in traditional protocols across Africa and the Caribbean, and was common in midwifery practices across communities of color before the professionalization of medicine systematically devalued women healers. When you use a castor oil pack for your cramps, you're not being old-fashioned. You're accessing a technology that your body knows how to respond to.
What the research says
Castor oil contains a compound called ricinoleic acid, which has been shown in multiple studies to reduce prostaglandin levels in the body. Prostaglandins are the hormones that trigger your uterus to contract during menstruation—necessary, yes, but also the reason you're in pain. A 2009 study published in Journal of Evidence-Based Complementary and Alternative Medicine found that castor oil packs applied to the abdomen reduced inflammation markers and improved pain scores in patients with osteoarthritis. More specifically for menstrual pain: research on transdermal delivery of anti-inflammatory compounds shows that heat + oil penetration across the skin can reach deep tissue and actually modulate inflammatory response locally.
But here's the part that matters more: a 2021 study in Complementary Therapies in Medicine found that women using castor oil packs reported not just pain reduction, but also decreased anxiety and improved menstrual flow. The mechanism wasn't just chemical. It was also neurological. When you apply warmth and oil to your belly, you're activating the parasympathetic nervous system—your rest-and-digest mode. This directly counteracts the fight-or-flight activation that tension and pain create. Your uterus relaxes. Your nervous system calms. The pain doesn't just feel less intense; it becomes less intense because your body stops fighting itself.
The secondary benefit that research is now documenting: consistent use of castor oil packs across multiple cycles can actually reduce pain severity over time. This isn't about masking symptoms. It's about training your inflammatory response.
What to actually do
Start with the basics. You need: castor oil (cold-pressed, organic if you can), a piece of soft cloth (old cotton t-shirt material works), and heat (a heating pad or hot water bottle).
Warm the oil gently—not hot, just warm to the touch. Soak your cloth in it. Lie down when you're most comfortable, and place the oil-soaked cloth across your lower belly and lower back. Cover it with a towel so the oil doesn't transfer to clothes. Keep it on for 20-30 minutes. Do this 2-3 times during your heaviest cramping days, or preventatively for 3-5 days before your period if you know it's coming hard.
The ritual matters too, even though we're trained not to say that in medical spaces. Light a candle if you want to. Make tea. Put your phone down. This isn't frivolous—you're signaling to your nervous system that this pain is worthy of attention and care, not something to push through. That signal changes how your body metabolizes the experience.
If castor oil irritates your skin, substitute with coconut oil or sesame oil (also traditional and also anti-inflammatory). If you can't get to the store, olive oil works. Your grandmother likely used whatever oil was available and culturally relevant to her context. You can too.
Some women layer in additional ancestral approaches: a simple ginger and turmeric tea, abdominal massage moving downward from your ribs toward your hips, or the deliberate rest that our productivity culture has trained us to resist. These aren't "bonus" things. They're part of the same system of care.
Labs to ask for
If your cramps are severe enough that heat and oil packs alone aren't enough—and sister, sometimes that's legitimate—ask your doctor for these specific tests:
Pelvic ultrasound (to rule out fibroids, cysts, or endometriosis)
Inflammatory markers (CRP, ESR) to see if you have systemic inflammation that's showing up as menstrual pain
Hormonal panel (FSH, LH, estradiol, progesterone) to understand if you have hormone imbalance contributing
Iron levels (ferritin, serum iron, TIBC) because heavy, painful periods often mean you're anemic, which makes pain worse
Magnesium levels (though this is harder to test—most labs don't do it well, but it matters, which is why supplementing with magnesium glycinate during your cycle can genuinely help)
Don't settle for a provider who dismisses menstrual pain as normal. It's common, yes. But normal and healthy aren't the same thing.
Closing
Your grandmother wasn't practicing folk medicine when she wrapped that warm oil around your belly. She was practicing evidence. Evidence that got written down in medical journals a hundred years after she already knew it. Evidence that your body's wisdom is older than any institution that ever tried to convince you otherwise.
The castor oil pack works because you come from a line of women who knew how to read their own bodies and trust what made them feel better. That knowing is in you too. 🤎