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How to tell if canned goods is bad

Updated 2026-05-13 · USDA & FDA spoilage guidelines

Quick check
Canned Goods keeps for about 5 years in normal storage. Past that, check for the signs below before eating.

The 5-second spoilage check

Use your senses in this order: look, smell, touch, taste (taste only if everything else passes, and only a tiny amount). Any single warning sign means toss it.

Visual signs canned goods has gone bad

  • Bulging can = BOTULISM risk, throw away unopened
  • Rust through the can
  • Foaming or hissing on opening
  • Off color of contents

Smell test

Fresh canned goods should smell clean and characteristic of itself. A sour, ammonia-like, fermented, sulfurous, or just plain "off" smell means bacteria have multiplied. The nose detects spoilage compounds at concentrations far below dangerous bacterial levels — if it smells bad, it is bad.

Texture changes

Slime is the most reliable spoilage indicator after smell. A film, sticky surface, or unusual softness/hardness signals bacterial breakdown. Mold growth (fuzzy spots) means there are also invisible mold fibers and possibly mycotoxins throughout — toss the entire item, not just the visible patch.

Can you eat canned goods past the expiration date?

"Best by", "use by" and "sell by" dates are quality estimates set by manufacturers — not safety cutoffs. Most foods are still safe for some time past these dates if no spoilage signs are present and they've been stored correctly. Trust your senses over the printed date.

Common mistakes that speed spoilage

  • BULGING CAN = botulism — DO NOT TASTE, discard immediately
  • Most canned food safe years past 'best by'
  • Transfer to glass/plastic after opening

What to do if you ate spoiled canned goods

  1. Don't induce vomiting. Most cases resolve on their own.
  2. Hydrate. Sip water, oral rehydration solution, or clear broth.
  3. Rest. Let your digestive system work through it.
  4. See a doctor if symptoms last more than 48 hours, you have a fever above 102°F, blood in vomit/stool, or signs of severe dehydration.
  5. High-risk groups (pregnant, elderly, immunocompromised, young children) should consult a doctor sooner.
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Frequently asked questions

How can you tell if canned goods has gone bad?
Look for: Bulging can = BOTULISM risk, throw away unopened; Rust through the can; Foaming or hissing on opening. When in doubt, throw it out — food poisoning is rarely worth the savings.
Can you eat canned goods past its expiration date?
"Best by" and "use by" dates indicate quality, not safety. Canned Goods can usually be eaten 1–7 days past the printed date if no spoilage signs are present.
What does spoiled canned goods smell like?
Spoiled canned goods typically develops a sour, fermented, or "off" smell that's clearly different from fresh. Trust your nose — it's a reliable spoilage detector.
Will I get sick from eating spoiled canned goods?
Possibly. Most foodborne illness comes from bacteria you can't see, smell or taste. Symptoms appear 1–48 hours after eating: nausea, vomiting, diarrhea, cramps. If symptoms last more than 48 hours, see a doctor.
Full guide
All shelf-life data for Canned Goods →