Period bloating is driven by hormonal shifts that cause your body to hold onto extra water and salt, but a combination of dietary changes, movement, and a few targeted supplements can meaningfully reduce it. Most people notice bloating in the one to two weeks before their period starts, with symptoms easing once bleeding begins.
Why Your Period Causes Bloating
In the days leading up to your period, estrogen and progesterone levels shift rapidly. These hormonal changes affect how your body regulates salt and fluid. When your body retains too much water and sodium, you feel puffy, tight, and uncomfortable, particularly around your abdomen. This is the primary driver of period bloating, and it’s entirely normal.
There’s a second layer to it. Your body ramps up production of chemical messengers called prostaglandins around your period. These trigger uterine contractions (cramps), but they also act on the smooth muscle in your digestive tract, either contracting or relaxing it. The result is gas, irregular bowel movements, and that heavy, distended feeling in your belly that sits on top of the fluid retention. So period bloating is really two things happening at once: water retention and digestive disruption.
Cut Back on Sodium Before Your Period
Salt is the most direct dietary lever you have. Eating salty foods makes your body hold onto more water, and your hormones are already pushing fluid retention in the premenstrual window. Reducing sodium intake in the week or so before your period can blunt the worst of it.
This doesn’t mean bland food. It means watching the biggest sodium sources: processed snacks, canned soups, fast food, soy sauce, and deli meats. Cooking at home with fresh ingredients during that stretch of your cycle gives you far more control. Potassium-rich foods like bananas, sweet potatoes, spinach, and avocados help your kidneys clear excess sodium, so leaning into those in the days before your period works in your favor.
Stay Hydrated, Even When It Feels Counterintuitive
Drinking more water when you already feel waterlogged sounds wrong, but it works. When you’re well hydrated, your kidneys get the signal that they can safely release excess sodium and fluid rather than hoarding it. Dehydration does the opposite: your body clings to every drop. Aim for consistent water intake throughout the day rather than trying to catch up in large amounts all at once.
Move Your Body Regularly
Exercise is one of the most effective tools for period bloating, and the research behind it is surprisingly strong. Aerobic exercise, specifically, helps your body reabsorb sodium and water through continuous muscular contractions. It also influences the hormones that regulate fluid balance, lowering concentrations of the chemicals that tell your body to retain fluid.
In one study, a progressive 60-minute aerobic exercise program done three times a week for eight weeks led to a 60% decrease in overall PMS symptoms and a 65% decrease in physical symptoms like bloating. Another found that 30-minute sessions three times a week at moderate intensity reduced bloating, nausea, constipation, and breast swelling compared to a non-exercising group. Women who exercised at least five hours a week reported fewer physical symptoms overall and lower scores on standardized PMS questionnaires.
You don’t need to hit five hours a week to see benefits. Three sessions of 30 to 60 minutes of brisk walking, cycling, swimming, or dancing is a reasonable target. The key is consistency across your cycle, not just exercising when symptoms hit.
Supplements That May Help
Magnesium
Magnesium plays a role in muscle relaxation and fluid balance, and small studies suggest that 150 to 300 milligrams per day can reduce PMS symptoms including bloating. Magnesium glycinate is the best-absorbed form and tends to be gentler on the stomach than other types. One study found benefits from 250 milligrams of magnesium paired with 40 milligrams of vitamin B6. You can start taking it daily or begin in the second half of your cycle and continue through your period.
Vitamin B6
Vitamin B6 shows some promise for premenstrual symptoms broadly, including bloating. A double-blind trial in 94 women found that 80 milligrams of B6 taken daily over three menstrual cycles led to significant reductions in bloating, irritability, moodiness, and anxiety. The evidence isn’t rock-solid yet, but B6 is inexpensive and well-tolerated at moderate doses, making it a reasonable option to try alongside other strategies.
Anti-Inflammatory Pain Relievers
If cramps accompany your bloating, ibuprofen or naproxen can pull double duty. These medications work by blocking prostaglandin production, which addresses both the uterine cramping and the digestive disruption those same chemicals cause. Taking them at the first sign of symptoms, rather than waiting until pain peaks, tends to work better because it’s easier to prevent prostaglandin buildup than to reverse it.
When Bloating May Signal Something Else
Normal period bloating follows a predictable pattern: it intensifies in the one to two weeks before your period, then eases once bleeding starts. If your bloating doesn’t follow that rhythm, or if it’s accompanied by painful or irregular periods, pain during sex, discomfort when using the bathroom, or blood in your urine, that pattern can point toward endometriosis or other conditions worth investigating. Bloating that’s severe enough to interfere with your daily life, even if it does track with your cycle, is also worth bringing up with a doctor.