Why Does My Acidity Get Worse Before My Period?

If you've noticed heartburn, bloating, or a burning sensation in your upper abdomen flaring up in the days before your period — you're far from alone. It's a pattern we see often in clinic, and one that's frequently dismissed as "just stress" or "something you ate." In reality, it's your hormones.

It's more common than you'd think

Roughly 7 in 10 menstruating women experience at least one gastrointestinal symptom around their period, and abdominal pain is the most commonly reported one of all.

Why it happens

The shift is driven by the natural rise and fall of hormones through your cycle:

• Progesterone relaxes the valve between your food pipe and stomach (the lower oesophageal sphincter), making it easier for acid to travel back up — this is what causes reflux.

• Prostaglandins — the same compounds behind period cramps — also contribute to bloating and abdominal pain.

• Estrogen can make your gut more sensitive to normal digestive sensations, so discomfort feels more pronounced than it would at other times of the month.

The key clue: timing

The biggest giveaway that this is hormone-related rather than a separate digestive condition is when it happens. These symptoms typically begin in the luteal phase — the one to two weeks before your period — and settle down once your period starts or ends. If your symptoms don't follow this pattern, or persist well beyond your period, it's worth getting checked for other causes rather than assuming it's cycle-related.

What helps — start simple

For most women, small adjustments in that predictable pre-period window make a real difference:

• Smaller, more frequent meals instead of large ones

• Eating dinner earlier, giving your stomach time to settle before you lie down

• Cutting back on caffeine in the days leading up to your period

When you need more than lifestyle changes

If symptoms are still bothering you despite these changes, an antacid can help — ideally one that's chosen and timed with your cycle in mind, rather than taken only after symptoms hit. Combination antacids (such as those containing aluminium and magnesium hydroxide, sometimes paired with a local anaesthetic component) are commonly used for fast, longer-lasting relief. As with any medication, the right choice and dose depends on your individual health history, so it's best discussed with your doctor rather than self-selected off a pharmacy shelf.

The bigger picture

Managing this well means being proactive, not reactive — anticipating the window in your cycle when symptoms tend to appear, and having a plan ready rather than scrambling once the discomfort starts.

If period-linked acidity, bloating, or abdominal pain is affecting your daily life, it doesn't have to be something you just put up with every month. We're happy to talk through what's driving it in your case and find an approach that fits