Premenstrual bloating typically starts in the last week before your period and resolves once bleeding begins. It’s one of the most common PMS symptoms, driven by hormonal shifts that cause your body to hold onto extra water and slow down digestion. The good news: a combination of dietary adjustments, regular exercise, and targeted supplements can meaningfully reduce how bloated you feel each cycle.
Why Your Body Bloats Before Your Period
In the second half of your cycle (the luteal phase), progesterone rises sharply. Progesterone naturally blocks the receptors that control sodium balance in your kidneys, which triggers a compensatory spike in aldosterone, the hormone that tells your body to retain sodium. More sodium means more water retention, and that’s what creates the puffy, tight feeling in your abdomen and sometimes your hands, feet, and breasts.
Progesterone also slows the movement of food through your intestines. This means gas sits longer in your gut, adding physical distension on top of the fluid retention. Both effects peak in the final week before your period and typically disappear within the first day or two of menstruation as hormone levels drop.
Cut Back on Sodium Early in Your Luteal Phase
Because aldosterone is already pushing your kidneys to retain sodium during this window, adding more through your diet amplifies the effect. Most people consume far more sodium than they realize from processed foods, restaurant meals, sauces, and deli meats. Reducing your sodium intake starting about 10 to 14 days before your expected period gives your body less raw material to hold onto.
You don’t need to eliminate salt entirely. Focus on cooking more meals at home where you control the seasoning, swapping canned soups and frozen meals for fresh alternatives, and reading labels for hidden sodium in bread, cheese, and condiments. Even a moderate reduction can make a noticeable difference in how tight your abdomen feels during that final premenstrual week.
Increase Potassium-Rich Foods
Potassium works opposite to sodium in your kidneys, helping your body release excess water rather than hold it. Loading up on potassium-rich foods during the second half of your cycle can counterbalance some of the aldosterone-driven retention. Bananas get all the credit, but avocados, sweet potatoes, spinach, beans, and yogurt are equally good (or better) sources. Aim to include at least one potassium-rich food at every meal in the week before your period.
Stay Consistent With Aerobic Exercise
Regular aerobic exercise is one of the most effective non-drug strategies for reducing premenstrual bloating, but the key word is “regular.” This isn’t something you can start two days before your period and expect results. Women who exercise aerobically three to six hours per week consistently report fewer physical PMS symptoms, including bloating, compared to sedentary women.
One study found that 30-minute sessions of moderate aerobic exercise three times a week (at an intensity that gets your heart rate to 120 to 150 beats per minute) significantly reduced bloating, breast tenderness, headaches, and appetite changes compared to a non-exercising group. Another progressive exercise program, 60 minutes three times a week for eight weeks, resulted in a 65% decrease in physical PMS symptoms overall. Walking briskly, cycling, swimming, or dancing all count. The habit matters more than the specific activity.
Exercise also stimulates intestinal motility, helping move gas and stool through your system faster. This directly counteracts the sluggish digestion that progesterone causes.
Magnesium and Vitamin B6 Supplements
Magnesium is involved in hundreds of processes in your body, including fluid balance and muscle relaxation. Small clinical studies suggest that 150 to 300 milligrams of magnesium daily can help with PMS symptoms. One study used 250 milligrams of magnesium paired with 40 milligrams of vitamin B6 and found improvements in both physical and mood-related symptoms. Magnesium glycinate tends to be better absorbed and gentler on your stomach than other forms like magnesium oxide.
Vitamin B6 on its own also has evidence behind it. A randomized controlled trial found that 80 milligrams of B6 taken daily over three menstrual cycles led to significant reductions in bloating, irritability, moodiness, and anxiety. B6 plays a role in producing neurotransmitters that regulate mood, which may explain why it helps with both the physical and emotional sides of PMS. For best results, start taking either supplement daily rather than only during the premenstrual window, since the benefits appear to build over multiple cycles.
Drink More Water, Not Less
It sounds counterintuitive when you’re already retaining fluid, but drinking more water actually helps your body release the excess. When you’re dehydrated, your kidneys hold onto even more sodium and water as a protective mechanism. Staying well-hydrated signals your body that it’s safe to let go of stored fluid. Aim for at least eight glasses a day, and more if you’re exercising or consuming caffeine.
Herbal teas like peppermint and ginger can pull double duty here. They contribute to your fluid intake while also helping relieve gas and support digestion, which addresses the intestinal side of bloating separately from the water retention side.
Reduce Gas-Producing Foods Strategically
Since progesterone slows your digestion in the luteal phase, foods that already tend to produce gas will produce even more of it during this window. Common culprits include beans, lentils, broccoli, cauliflower, cabbage, onions, carbonated drinks, and sugar-free foods containing sugar alcohols. You don’t need to avoid these foods all month. Just be mindful of portion sizes in the week before your period, and consider spacing them out rather than eating large amounts in one sitting.
Eating smaller, more frequent meals also helps. Large meals stretch the stomach and slow transit time further when your gut is already sluggish. Five smaller meals spread across the day can keep things moving more efficiently than three large ones.
Limit Alcohol and Refined Carbohydrates
Alcohol is a double hit before your period. It dehydrates you (prompting your kidneys to compensate by retaining more water afterward) and irritates the gut lining, which can worsen gas and bloating. Refined carbohydrates and sugary foods cause rapid spikes in blood sugar, which triggers insulin release. Insulin promotes sodium retention through the same kidney pathways that aldosterone uses, compounding the bloating effect. Swapping refined carbs for whole grains, and cutting back on alcohol in the premenstrual week, removes two amplifiers of the bloating you’re already prone to.
When Bloating Might Signal Something Else
Normal premenstrual bloating follows a predictable pattern: it shows up in the last week before your period and disappears once menstruation starts. If your bloating doesn’t follow this cycle, persists throughout the month, or gets progressively worse over several months, it could point to something other than PMS.
Ovarian cysts, for instance, can cause bloating along with pelvic pain (often on one side), a feeling of fullness or pressure in your abdomen, and changes to your menstrual cycle. Most small cysts resolve on their own, but sudden severe pelvic pain, pain with fever or vomiting, or signs of shock like clammy skin and lightheadedness need immediate medical attention. Endometriosis and irritable bowel syndrome can also mimic or overlap with premenstrual bloating. If your symptoms don’t fit the typical luteal-phase pattern, or if they’ve changed noticeably over recent cycles, that’s worth investigating further.