Period bloating typically starts in the second half of your cycle, around two weeks before your period, and resolves once menstruation begins. It’s driven by hormonal shifts that slow your digestion and increase water retention, but both of those effects respond well to simple changes in what you eat, drink, and do during that window.
Why Your Period Makes You Bloated
Two hormones are responsible. Progesterone rises after ovulation and slows digestion, which lets gas build up in your intestines and leads to constipation. That sluggish gut is what many people call “PMS belly.” Meanwhile, estrogen affects how fast food moves through your digestive tract in the opposite direction, sometimes causing looser stools. The push and pull between these two hormones makes your intestines prone to spasms, where the muscles tighten unpredictably, causing pain and alternating bouts of constipation and diarrhea in the week or so before your period starts.
On top of the digestive slowdown, hormonal changes also cause your body to hold onto more water. This fluid retention is what makes your abdomen feel puffy and tight even when gas isn’t the main issue. So period bloating is really two problems at once: a sluggish gut producing more gas, and tissues holding extra fluid.
Cut Back on Salt
Sodium is the single biggest dietary factor in water retention. Eating salty foods signals your body to hang onto more fluid, and that effect is amplified during the luteal phase when your hormones are already pushing you toward retention. Reducing your salt intake in the one to two weeks before your period can make a noticeable difference. That means watching for hidden sodium in processed foods, canned soups, deli meats, and restaurant meals, not just the salt shaker on the table.
Eat More Potassium-Rich Foods
Potassium works as a counterbalance to sodium. Your body uses it to regulate how much water it retains, so the better that system functions, the less bloated you feel. Good sources include bananas, avocados, sweet potatoes, spinach, and yogurt. Building these into your meals during the second half of your cycle helps your kidneys flush excess fluid rather than store it.
Drink More Water, Not Less
It sounds counterintuitive when you already feel swollen, but staying well hydrated actually helps reduce water retention. When your body senses it’s getting enough fluid, it’s less likely to hold onto reserves. Dehydration, on the other hand, triggers your body to conserve every drop it can. Aim for consistent water intake throughout the day rather than large amounts at once.
Consider Magnesium
Magnesium is one of the better-studied supplements for PMS-related bloating. Taking about 360 mg per day has been linked to reduced fluid retention and breast tenderness. One study found that women who took 200 mg daily had noticeably less water retention by their second month on the supplement. If you want to try it, starting a few weeks before you expect symptoms gives your body time to build up adequate levels. You can also increase magnesium through foods like dark chocolate, nuts, seeds, and leafy greens.
Move Your Body Gently
Exercise helps gas move through a sluggish digestive tract, and you don’t need an intense workout to get the benefit. Just a few minutes of gentle movement a couple of times a day can help. Some of the most effective options target your core and compress your abdomen in ways that physically encourage gas to pass:
- Knees to chest: Lie on your back and hug both knees toward your chest for several deep breaths. This is especially helpful right when you wake up or before bed.
- Cat-cow: On your hands and knees, alternate between arching your back downward (lifting your head) and rounding your back upward (tucking your chin). The rhythmic motion massages your digestive organs.
- Child’s pose: Kneel on the floor, sit back onto your heels, and stretch your arms forward while lowering your chest toward the ground.
- Diaphragmatic breathing: Breathe in through your nose and out through your mouth, expanding your belly, ribcage, and back with each inhale. This creates gentle internal pressure changes that help move trapped gas.
Walking also works well. Even 10 to 15 minutes after a meal can keep your digestive system from stalling out completely during the progesterone surge.
Time Your Efforts to Your Cycle
The luteal phase begins around day 15 of a 28-day cycle and ends when your period arrives. That roughly two-week window is when bloating builds. Most people notice it getting worse in the final week before their period. The good news is that bloating typically fades once menstruation starts, because progesterone drops sharply and your body begins releasing the extra fluid it was holding.
This means your dietary and lifestyle adjustments don’t need to be permanent. Shifting to lower-sodium, higher-potassium meals and adding gentle movement during those two weeks can be enough to take the edge off without overhauling your entire routine.
When Bloating May Signal Something Else
Normal period bloating is uncomfortable but manageable. If your bloating comes with pelvic pain that goes beyond tolerable cramping, pain during bowel movements or urination, pain during sex, or fatigue and nausea that interfere with your ability to work or go to school, that pattern is worth investigating. Endometriosis, which affects the tissue lining the uterus, can cause bloating, constipation, and nausea that intensify during periods. A key difference is that the pain tends to get worse over time rather than staying predictable cycle to cycle, and it often extends beyond the days of your actual period.