: an unpleasant feeling (such as pain or a burning sensation) in your stomach or chest that is caused by difficulty in digesting food
The patient complained of indigestion and nausea.
I like spicy foods but they always give me indigestion.
an attack of indigestion
acid indigestion
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“Indigestion.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/indigestion. Accessed 14 Apr. 2026.
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