Period cramps happen because your body produces hormone-like molecules called prostaglandins, which force the uterine muscle to contract so it can shed its lining each month. The more prostaglandins you produce, the stronger those contractions and the worse the pain. That’s the core mechanism, and nearly every effective remedy works by either lowering prostaglandin levels or interrupting the pain signals they create.
Why Some Periods Hurt More Than Others
Prostaglandins are produced right at the site of tissue breakdown, which in this case is the uterine lining as it separates during your period. At normal levels, they cause mild contractions and maybe some dull achiness. At excessive levels, they trigger intense cramping, increased pain sensitivity, heavier bleeding, and even loose stools (the so-called “period poops” are prostaglandins at work in the gut, too).
The amount of prostaglandins your body releases varies from cycle to cycle and from person to person. Stress, sleep, diet, and underlying conditions all play a role. This is why your cramps can feel dramatically different one month compared to the next, and why what works for a friend might not be enough for you.
Anti-Inflammatory Pain Relievers Work Best
NSAIDs like ibuprofen and naproxen are the most effective over-the-counter option because they directly block prostaglandin production, not just pain signals. Two large analyses of clinical trials found that all NSAIDs studied were more effective than acetaminophen (Tylenol) for period pain. Since they perform about equally well, the choice comes down to cost and convenience.
Timing matters more than most people realize. NSAIDs work best when you start taking them one to two days before your period begins and continue through the first two to three days of bleeding. If you wait until the pain is already intense, prostaglandins have already flooded the tissue and you’re playing catch-up. If your cycle is predictable enough, preloading is the single biggest upgrade you can make to your pain management.
Acetaminophen can take the edge off if you can’t tolerate NSAIDs, but it doesn’t reduce prostaglandin levels, so it’s a weaker option for cramps specifically.
Heat Therapy Rivals Medication
A heating pad on your lower abdomen isn’t just comforting. A 2025 systematic review of 22 randomized trials found that heat therapy provided pain relief comparable to, or slightly better than, NSAIDs after three months of use. Even within the first 24 hours, heat performed on par with medication. And heat carried roughly 70% fewer side effects than NSAIDs across the studies reviewed.
Electric heating pads, adhesive abdominal warmers, and far-infrared belts all showed benefit. Study sessions typically lasted 20 to 30 minutes per application. If you want to avoid medication entirely, heat is the strongest non-drug option available. Combining the two, heat plus an NSAID, is a reasonable strategy for severe cramps.
Exercise as a Long-Term Strategy
Regular exercise reduces period pain, but it’s a cumulative effect rather than an instant fix. A 2025 review of existing studies found that exercising two to three times a week reduced menstrual pain meaningfully. The sweet spot appears to be at least 90 minutes of exercise per week, sustained for a minimum of eight weeks before you can expect noticeable improvement.
Strength training for at least 30 minutes per session produced the greatest pain reduction in the review. Aerobic exercise also helps. The mechanism likely involves both a reduction in prostaglandin activity over time and the release of the body’s own pain-relieving chemicals during and after a workout. You don’t need to exercise during your period specifically, though some people find light movement on painful days helps. The real benefit comes from consistency across the whole month.
Supplements Worth Trying
Two supplements have the most clinical support for period cramps, though the evidence is modest compared to NSAIDs or heat.
- Magnesium: Three small trials found it decreased menstrual pain compared to placebo. A daily dose of 300 to 600 mg is the range used in studies. Magnesium glycinate or gluconate forms are less likely to cause digestive issues than magnesium oxide.
- Vitamin B1 (thiamine): A dose of 100 mg daily improved menstrual pain in one study, but only after at least 30 days of continuous use. This isn’t something you take on the day cramps hit. It requires one to three months of daily supplementation before you can judge whether it’s working.
Neither supplement is a replacement for NSAIDs on a bad day, but they may reduce your baseline pain level over time, especially if your diet is already low in magnesium.
Hormonal Options for Severe Cramps
If over-the-counter methods aren’t enough, hormonal contraceptives are the standard next step. They work by thinning the uterine lining, which means less tissue to break down and fewer prostaglandins released during your period. Less prostaglandin means less pain.
The combined oral contraceptive pill is the most common choice. If standard cyclic use (with a placebo week) doesn’t provide enough relief, continuous use, skipping the hormone-free week entirely, is recommended because it prevents the withdrawal bleed altogether. Other hormonal options include a progestogen-releasing IUD (which lasts five to eight years), a subdermal implant (three years), or oral progestogen taken daily. All of these reduce or eliminate monthly lining buildup.
Hormonal management is particularly useful when cramps are severe enough to interfere with school, work, or daily life on a regular basis.
TENS Units for Drug-Free Relief
A TENS (transcutaneous electrical nerve stimulation) unit sends mild electrical pulses through adhesive pads on your skin, which can interrupt pain signals traveling to the brain. For period pain, a frequency of 80 to 100 Hz with a pulse width around 100 microseconds is typical. The intensity should produce a strong buzzing sensation without actual pain.
Electrode placement matters. With a four-pad setup, you can place all four on your lower back: two higher up (around the bra-line level, covering the nerves that supply the uterus) and two lower (near the top of the buttocks, covering nerves to the pelvic area). Alternatively, put two pads on your lower back and two on your lower abdomen over the area that hurts most. TENS units are portable and inexpensive, and they can be used alongside any other method on this list.
When Cramps Signal Something Else
Most period pain is “primary dysmenorrhea,” meaning it’s caused by normal prostaglandin activity with no underlying disease. But pain that gets progressively worse over time, starts several days before bleeding, or doesn’t go away after your period ends can signal a condition like endometriosis or uterine fibroids.
Endometriosis involves tissue similar to the uterine lining growing outside the uterus, on the ovaries, fallopian tubes, bladder, or elsewhere in the pelvis. This tissue responds to hormonal cycles just like the lining inside the uterus, breaking down and bleeding with nowhere to drain. Over time, scar tissue can form and bind organs together, creating chronic pain. Fibroids are growths in or on the uterine wall. Larger ones or those embedded in the muscle layer tend to cause pain, while small fibroids often don’t.
If your cramps have changed character, escalated in severity, or stopped responding to treatments that used to work, that pattern is worth investigating rather than pushing through.