Why Do You Get Period Cramps and How to Actually Fix Them

Quick answer: Period cramps happen when your uterus releases prostaglandins — compounds that trigger the contractions shedding your uterine lining. Higher prostaglandin levels mean stronger, more painful cramps, often worsened by inflammation, low magnesium, or hormone imbalance. The most effective fixes combine anti-inflammatory nutrition, heat, movement, and full-cycle hormone support.

If you've ever wondered why some months feel unbearable and others barely register, the answer isn't random. It's biochemistry. Let's break down what's actually happening in your body — and what to do about it.

What Causes Period Cramps, Really?

Cramps come from prostaglandins — hormone-like compounds released by your uterine lining that trigger the contractions which shed it each month.

Period cramps (the clinical term is dysmenorrhea) start with your uterine lining. Each month, if pregnancy doesn't happen, your body prepares to shed that lining. To do this, your uterus releases prostaglandins, which cause the uterine muscle to contract. According to the American College of Obstetricians and Gynecologists (ACOG), prostaglandin levels are highest on the first day of a period and fall as bleeding continues — which is why pain tends to ease after the first day or two.

Those contractions physically expel the lining. The catch: prostaglandins also constrict blood vessels, briefly cutting off oxygen to uterine tissue. That combination — muscle contraction plus reduced blood flow — is what produces the cramping sensation.

Here's the detail most people never learn: the amount of prostaglandins you produce isn't fixed. It's influenced by inflammation, diet, and hormone balance — which is exactly why cramps can be improved, not just endured.

Primary vs. Secondary Cramps: Know the Difference

Primary cramps come from prostaglandins alone; secondary cramps are caused by an underlying condition like endometriosis, adenomyosis, or fibroids.

If your cramps are severe enough to affect daily life, getting worse year over year, or paired with heavy bleeding, it's worth ruling out secondary causes with a doctor rather than assuming it's "just a bad period." (Source: ACOG, Dysmenorrhea: Painful Periods)

Why Are Some People's Cramps Worse Than Others?

Chronic inflammation, low magnesium, estrogen dominance, and everyday hormone disruptors can all push prostaglandin production higher.

Prostaglandins don't operate in a vacuum — several everyday factors can push production higher:

• Chronic inflammation. Diets high in processed foods and certain seed oils encourage the production of the more inflammatory prostaglandin types.
• Low magnesium. Magnesium helps relax uterine muscle. Low levels are linked to more intense cramping.
• Estrogen dominance. When estrogen is high relative to progesterone, the uterine lining tends to build up thicker — meaning more tissue to shed, and more prostaglandins released to do it.
• Everyday hormone disruptors. Certain plastics, fragrances, and conventional personal care products contain compounds that mimic estrogen in the body.

This is also why cramps often shift throughout a person's life — after coming off birth control, in the years leading up to perimenopause, or during periods of high stress, all of which shift the estrogen-to-progesterone ratio.

How Do You Actually Fix Period Cramps?

Combine anti-inflammatory nutrition, magnesium, heat, gentle movement, and full-cycle hormone support — cramps are easiest to manage when you address the pattern, not just the pain.

1. Eat anti-inflammatory, especially in the luteal phase

   The days before your period (the luteal phase) are when prostaglandin production ramps up. Prioritizing omega-3 rich foods (like salmon, walnuts, and flax), leafy greens, and reducing processed seed oils in the week before your period can measurably lower inflammatory prostaglandin output. If you want a deeper breakdown of what to eat and drink through this window, our guide on the best teas for PMS, bloating, and hormone balance covers the luteal phase in detail.

2. Get enough magnesium

   Magnesium-rich foods — pumpkin seeds, dark chocolate, spinach, almonds — support uterine muscle relaxation. Many people are chronically under-consuming magnesium without realizing it.

3. Use heat therapy

   This isn't just a comfort trick — the NHS notes that heat helps relax the muscles of the womb and improves blood flow, which reduces pain, and some studies show it works about as well as over-the-counter pain relievers for cramp intensity.

4. Move, even gently

   Light movement — walking, stretching, restorative yoga — increases circulation and has been shown to reduce cramp severity, even though exercise is often the last thing you feel like doing.

5. Support your hormones all cycle long, not just on day one

   This is the piece most people miss. Cramps are the symptom; the hormone pattern that produces them builds over your entire cycle. Rather than only reacting once pain hits, syncing your nutrition and habits to each phase — follicular, ovulation, luteal, and menstrual — helps address the estrogen-progesterone balance that drives prostaglandin production in the first place.

6. Use herbal support during your period

   Certain warming herbs have traditionally been used in Traditional Chinese Medicine to ease menstrual discomfort and support circulation during your period. Our FLOW blend — the menstrual-phase blend in the Inner Code tea ritual — is made with ginger, fennel, and aged mandarin peel: ginger and fennel are both warming and antispasmodic, traditionally used to relieve the cramping and stagnation many women feel on the first days of their period. You can read more about the TCM logic behind these ingredients in our guide to the best herbs for period support, or shop the Cycle-Synced Tea Ritual directly.

When Are Period Cramps a Sign of Something More?

Pain that disrupts daily life, keeps worsening, or comes with other symptoms outside your period window is worth a medical evaluation.

See a doctor if you experience any of the following:

• Pain severe enough to interfere with work, school, or daily activities
• Cramps that are getting worse year over year, not better
• Pain during sex, bowel movements, or urination around your period
• Periods lasting longer than 7 days or requiring you to change protection every hour

These can be signs of endometriosis or other conditions that need a proper diagnosis — no amount of magnesium or heat will fix an underlying condition, and getting checked early makes a real difference. (Sources: ACOG, NHS)

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