Guide
Does ginger cause diarrhea, bloating or constipation?
No trial has isolated diarrhea as its own measured outcome for ginger. What is documented is general gastrointestinal upset — heartburn, abdominal discomfort, occasional nausea — as ginger's most common side effect, and a higher rate of digestive complaints at a concentrated extract dose than at plain-powder amounts. There's no trial evidence that ginger works as a laxative or reliably causes constipation.
No trial has isolated diarrhea as its own measured outcome for ginger. What the research does document is general gastrointestinal upset — heartburn, abdominal discomfort, occasional nausea — as ginger's most commonly reported side effect, more frequent at higher, concentrated doses than at typical amounts.
What's actually documented
A National Institutes of Health reference database describes ginger as generally well tolerated, listing bad taste, heartburn, abdominal discomfort, weight gain, headache, dry mouth and occasional nausea as side effects reported from time to time in adults — diarrhea isn't broken out as its own item in that list. The clearest dose-related GI data comes from a 261-person knee osteoarthritis trial: a concentrated ginger extract at 255 mg twice daily caused gastrointestinal side effects in 59 people versus 21 on placebo over 6 weeks, close to three times as many, mostly described as mild. That trial didn't publish a breakdown of which specific symptoms (diarrhea, gas, bloating) made up that count, so it confirms more digestive upset overall at that dose without confirming diarrhea by name.
The nausea question runs the other way
A lot of the search traffic behind this question is really asking whether ginger helps an upset stomach, not whether it causes one. That's a separate, mixed picture: a 576-person trial found 0.5-1.5 grams of ginger a day reduced acute nausea on the first day of chemotherapy, alongside standard anti-nausea medication, while a smaller, similarly designed trial at 500 mg twice daily found no significant difference from placebo. Neither trial tested ginger for everyday stomach upset, food poisoning or a stomach bug specifically — see ginger benefits: what the research does and doesn't show for exactly who was studied and at what dose in each case.
Laxative effect and constipation: neither is established
We found no trial testing ginger as a laxative, and no research establishing that it reliably causes constipation either. Anecdotal reports go in both directions, which is consistent with there being no controlled research settling the question either way. If a change in bowel habits after starting ginger is new, persistent or bothersome, that's worth mentioning to a doctor rather than assuming it's expected.
When it's more than routine digestive upset
Mild, occasional stomach discomfort is within what the research above describes. Diarrhea or abdominal pain that's severe, doesn't resolve, or shows up alongside unusual bruising or bleeding is different — ginger has a documented, dose-dependent effect on platelet function, covered in ginger and medications: what to check, and that combination is worth a call to a doctor rather than waiting it out.
Questions people ask
Does ginger root make you poop?
No trial in our research tested this directly, and we found no evidence establishing ginger as a laxative. Some people report a digestive effect anecdotally, but that isn't the same as a controlled finding.
Does ginger root help nausea?
It depends on the cause. Trials found a benefit for motion sickness and for reducing acute nausea on the first day of chemotherapy at specific doses alongside a standard anti-nausea medication, while other chemotherapy and postoperative-nausea trials found no meaningful difference from placebo. See ginger benefits: what the research does and doesn't show for the specifics by cause.
Can ginger cause heartburn or acid reflux?
Heartburn is one of the side effects most consistently reported across the sources reviewed here, especially at higher amounts. See ginger side effects for the fuller picture.
Can ginger cause gas or bloating?
Gas and abdominal discomfort are among the digestive symptoms recorded in trials, generally at higher, more concentrated doses than a typical serving of fresh ginger or tea. No trial has measured this at culinary amounts specifically.
Related reading: ginger side effects, ginger benefits: what the research does and doesn't show, and how much ginger should you take a day?.
Sources
- Ginger A National Institutes of Health reference database describes ginger's active compounds (gingerols, shogaols), confirms its GRAS food-flavoring status, notes it's commonly used for nausea and motion sickness, and flags mild common side effects plus a bleeding-risk interaction with warfarin.
- Effects of a ginger extract on knee pain in patients with osteoarthritis In a 261-person, 6-week trial, people with knee osteoarthritis taking a concentrated ginger extract (255 mg twice daily) were more likely to see a meaningful drop in pain-on-standing scores than those on placebo (63% vs 50%), though the ginger group also had close to three times as many mild digestive side effects.
- Ginger (Zingiber officinale) reduces acute chemotherapy-induced nausea: a URCC CCOP study of 576 patients In a 576-patient trial, cancer patients taking 0.5-1.5 grams of ginger a day alongside their standard anti-nausea medication had less severe nausea on the first day of chemotherapy than those on placebo, with the biggest effect at the two lower doses tested.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.