Bloating – Bloating in the evening: common causes
In short: A stomach that gets bigger and bigger over the course of the day is not unusual. Usually, gases from digestion build up, made worse by sitting for long periods, stress or certain foods. If the bloating is there almost every evening and bothers you, it's worth looking at causes such as SIBO or an imbalanced gut flora.
Why in the evening?
With every meal, food reaches the gut, where bacteria ferment part of it. The gases build up over the day. On top of that, sitting a lot means the gut moves less, and the abdominal muscles are often tired by the evening. So the stomach becomes visibly rounder.
Common causes
- Certain foods: pulses, cabbage, onions or lots of raw vegetables produce more gas.
- Eating habits: eating quickly, large portions, constant snacking, late main meals.
- Little movement: sitting for long periods at the office or working from home.
- Stress: it slows digestion and makes the gut more sensitive.
- Constipation: the longer stool stays in the gut, the more gas is produced.
- Cycle: many women notice more bloating in the second half of their cycle.
- SIBO or dysbiosis: if too many bacteria live in the small intestine or the gut flora is out of balance, fermentation starts too early. More on this: SIBO: when your bloating isn't “normal”.
What you can try yourself
- eat slowly and chew well
- have your main meal at lunchtime and something lighter and cooked in the evening
- take a short walk after eating
- caraway, fennel and anise tea between meals
- keep a food and symptom diary to spot patterns
When it's worth getting checked
If your stomach is very bloated almost every evening, even small meals cause discomfort or none of the above helps, a targeted assessment is worthwhile – for example a lactulose breath test for SIBO or a microbiome analysis if dysbiosis in the large intestine is suspected.
When should I see a doctor first?
Blood in the stool, unintended weight loss, fever, pain at night or a stomach that is bloated all the time and not just in the evening should be checked by a doctor first.
Find out more: Bloating assessment.
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