What causes interstitial cystitis?
Last updated September 6, 2026.
**Interstitial cystitis has no single known cause, and researchers believe it comes from a mix of a damaged bladder lining, oversensitive bladder nerves, and inflammation rather than from a bacterial infection.** The leading explanation is that the protective coating inside your bladder becomes leaky, so substances in urine irritate the bladder wall and keep the nerves in it firing. Pelvic floor muscle tension, mast cell activity, and past pelvic surgery or trauma can add to the pain signals. It is not spread from person to person, it is not caused by anything you did, and antibiotics will not clear it because there is no infection to treat. Certain foods, stress, and hormonal shifts around your period do not cause the condition, but many people find they set off flares. Keeping a short symptom and food diary for two weeks is the most useful first step, because it shows which triggers actually matter for you.
What to do
- Rule out infection first: Ask for a urine test before assuming bladder pain is interstitial cystitis, since a urinary tract infection, stones, and other bladder conditions cause similar symptoms.
- Track your triggers: Log food, drinks, stress, and pain for two weeks to see whether coffee, alcohol, citrus, tomatoes, artificial sweeteners, or spicy food line up with your flares.
- Test one change at a time: Remove a single suspected trigger for a week and add it back, rather than cutting many foods at once and losing nutrition for no benefit.
- Do not keep taking antibiotics: Repeat courses for negative urine cultures will not ease this pain and raise your risk of antibiotic resistance and side effects.
- Ask about pelvic floor therapy: Tight pelvic floor muscles drive symptoms in many people, and a physical therapist trained in pelvic health can treat that directly.
- Get seen for warning signs: Blood in your urine, fever, flank pain, or a sudden change in your usual pattern needs a clinician promptly rather than self-management.
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