Cycle-aware journal
Every log shows the day of your cycle. Bloating on day 24 is annotated as luteal, not as 'random'.
- Period start logging
- Auto phase calculation
- PMS symptom tags
For women
Gut tracking that knows about your cycle.
Women are twice as likely to have IBS, and symptoms swing predictably with the menstrual cycle. A Gut Day cross-references your cycle phase with your gut data.
Why gut symptoms shift with your cycle
Progesterone slows gut motility (often constipation in the luteal phase). The drop in progesterone before menstruation reverses this and triggers prostaglandin release - which speeds transit and explains period-time loose stools. Most gut apps ignore this entirely. A Gut Day treats your cycle as a first-class signal alongside food, sleep and stress.
What you get
Cycle phase tracking
Log your period start. The app marks follicular, ovulation, luteal and menstrual phases on every chart.
Phase-adjusted insights
The trigger ranking accounts for your phase - so you do not blame the salad for luteal-phase bloating.
Pattern detection
After 2 to 3 cycles, the app flags 'symptoms cluster around day 24' or 'reflux peaks mid-cycle'.
How A Gut Day helps
Built for this exact problem
Pregnancy and postpartum support
Switch to a no-cycle mode. Track common pregnancy symptoms (constipation, reflux) without false 'cycle' patterns.
- Pregnancy mode
- Postpartum mode
- Menopause/peri mode
Iron and supplement tracker
Iron supplements can cause constipation or dark stools. The app tags these so you can spot supplement-driven symptoms.
- Supplement log
- Side-effect tagging
- Reminder scheduling
Endometriosis-aware
Many endometriosis sufferers have IBS-like symptoms. The app helps you separate gut from gynae signals.
- Pelvic pain tag
- Bowel-pain correlation
- Doctor-ready PDF
How A Gut Day works for women
- 1
Log your last period start
The app calculates your phase automatically and marks every chart accordingly.
- 2
Track normally for 2 cycles
Food, symptoms, sleep, stress - the usual stuff. Cycle context is added in the background.
- 3
Review by cycle phase
See your bloating, urgency and stool patterns split by phase. The differences are usually striking.
- 4
Adjust life around it
Many women plan low-trigger eating in their luteal phase, knowing their gut is more reactive then.
Why women are diagnosed with IBS twice as often as men
Hormonal cycling is the biggest factor. Receptors for sex hormones sit on enteric nerves, and the cyclical hormone shifts directly modulate gut motility, visceral sensitivity and inflammation.
Women also tend to seek care more readily, which inflates the diagnostic gap. But even controlling for that, women genuinely have more variable gut function than men - and a cycle-aware tracker is what makes the variability legible.
Perimenopause and the gut
Falling and erratic oestrogen during perimenopause changes microbiome composition and often unmasks new IBS-like symptoms. Women who never had gut issues suddenly find themselves bloated and reactive in their late 40s.
The app supports a perimenopause mode that drops the cycle-prediction algorithm and instead surfaces longer-term shifts in baseline symptoms.
Frequently asked questions
- Do I need to track my cycle separately?
- No - just log the start of each period in A Gut Day. The app calculates phase automatically.
- What if I am on hormonal birth control?
- Combined hormonal contraception flattens the cycle. The app lets you switch off cycle-tracking and run in flat mode.
- I have endometriosis. Is the app useful?
- Yes. The pelvic-pain tag plus the bowel symptom log helps you and your doctor distinguish gynae from gut origin pain.
- Does it sync with my period app?
- Apple Health integration brings cycle data over automatically. Other period apps - manual logging for now.
- Is this just for women with IBS?
- No - any woman who notices her gut behaves differently across her cycle benefits. Even without IBS, knowing your reactive days is useful.
Track your gut, with your cycle in the picture
Free cycle-aware tracking, phase-adjusted insights and pregnancy/perimenopause modes.
Create your free account