During a Crohn’s disease flare, diarrhea and vomiting can increase the risk of dehydration and electrolyte loss. Gastroenterology and IBD guidance generally emphasizes replacing lost fluids while choosing beverages that are easier to tolerate. Water is often appropriate for routine hydration, while an oral rehydration solution may be useful when significant diarrhea causes fluid and electrolyte losses.
For routine hydration, water is usually a simple choice. If diarrhea is mild, drinking water regularly may be enough to replace lost fluid.
During a flare, some people find it easier to:
The Crohn’s & Colitis Foundation recommends staying hydrated and notes that water is among the fluids that can help maintain hydration.
When diarrhea is causing substantial fluid and electrolyte loss, an oral rehydration solution (ORS) can be more appropriate than simply replacing water.
ORS contains a specific balance of fluids, salts, and carbohydrates designed to support absorption. The Crohn’s & Colitis Foundation specifically lists oral rehydration solutions among hydration options during periods of diarrhea.
However, people with conditions such as kidney disease or diabetes may need individualized advice about which rehydration products are appropriate.
Depending on individual tolerance, broth and other relatively simple fluids can provide hydration while being easier to consume when appetite is low.
The Crohn’s & Colitis Foundation includes broth among possible hydration choices and notes that an electrolyte drink diluted with water may be tolerated by some people.
If a particular beverage consistently causes cramping, urgency, or diarrhea, it may be worth avoiding it and discussing the pattern with an IBD dietitian.
Certain drinks can aggravate symptoms for some people.
Large amounts of sugar can draw additional water into the intestine and potentially worsen diarrhea. The Crohn’s & Colitis Foundation specifically advises caution with sugary beverages, including some juices, sodas, and sports drinks.
Coffee, caffeinated tea, energy drinks, and other caffeinated beverages may stimulate the bowel and increase diarrhea in some people.
Alcohol can contribute to dehydration and may aggravate gastrointestinal symptoms during a flare. IBD guidance generally recommends avoiding or limiting alcohol when symptoms are active.
Carbonated beverages may increase gas and abdominal discomfort for some people. Individual responses vary, so they don't necessarily need to be avoided by everyone.
Sports drinks contain water, sugar, and electrolytes, but their electrolyte and sugar concentrations vary. Some may contain more sugar than is ideal when diarrhea is already present.
The Crohn’s & Colitis Foundation notes that sports drinks may help replace fluids and electrolytes during severe diarrhea, but excess sugar can worsen diarrhea and some drinks may need dilution.
An oral rehydration solution specifically formulated for rehydration may therefore be preferable in situations involving significant fluid loss.
A severe flare accompanied by substantial diarrhea or vomiting can lead to dehydration. Seek medical advice promptly if you cannot keep fluids down, have persistent or severe diarrhea, become very weak or dizzy, or notice other concerning symptoms.
People with Crohn’s disease should also contact their healthcare team when a flare is severe or substantially different from their usual symptoms.
During a Crohn’s flare, water is often a reasonable choice for everyday hydration, while an oral rehydration solution may be useful when diarrhea causes significant fluid and electrolyte losses. Very sugary beverages, caffeine, alcohol, and some carbonated drinks can make symptoms worse for certain people. Because Crohn’s affects everyone differently, keeping track of individual beverage triggers can be useful when working with a gastroenterologist or IBD dietitian.