What to do if you suspect food poisoning from a restaurant

Most foodborne illness cases never get reported. People throw up, feel awful for a day, then go on with their lives and never tell anyone. Which is part of why restaurants with chronic problems can keep operating — the data the city gets is missing huge chunks of what's actually happening.

If you think you got sick from a restaurant, here's the practical guide.

Step 1: Track the symptoms and the timeline

Foodborne illness has different incubation periods depending on what you got: - **Staph aureus toxin** — 30 minutes to 8 hours - **Norovirus** — 12 to 48 hours - **Salmonella** — 6 to 72 hours (often around 24) - **E. coli** — 1 to 8 days (typically 3–4) - **Listeria** — 1 to 70 days (typically 1–4 weeks)

If you got sick 30 minutes after dinner, it probably wasn't dinner — that's too fast. If you got sick 18 hours later, dinner the night before is a real candidate. If you got sick 4 days later, dinner is unlikely; something more recent is more probable.

Write down: - What you ate, where, and when - What others in your party ate (and whether they got sick) - When symptoms started - What the symptoms are (vomiting, diarrhea, fever, cramps, blood) - Whether you've eaten anything else suspicious in the same window

Step 2: Take care of yourself first

Most foodborne illness resolves on its own in 1–3 days with rest and hydration. Worry signs that need a doctor: - Fever above 102°F - Bloody stool or vomit - Severe dehydration (no urination for 8+ hours, dizziness) - Symptoms lasting more than 3 days - Pregnancy (Listeria is dangerous to pregnancies) - Immunocompromised, elderly, or very young

If any of these apply, call your doctor or go to urgent care. Don't tough it out.

Step 3: Report it to the city

This is the part most people skip. Reporting matters because the city's complaint system is one of the main ways inspectors get triggered to visit a restaurant outside the routine schedule.

In Chicago, you have a few options: - **311** (call or use the app) — File a "foodborne illness" complaint. - **Chicago Department of Public Health website** — Online food complaint form. - **CDPH foodborne illness hotline** — A direct line, available during business hours.

Be specific. Include the restaurant name and address, the dish you ate, the timeline, and the symptoms. The city investigates clusters more aggressively, so even one report from one person can matter — but reports really start moving when multiple people from the same meal call in.

Step 4: Tell anyone else who ate with you

Get them to report too. Two reports about the same meal at the same restaurant carry much more weight than one. The city is much more likely to dispatch an inspector for a cluster than for a single complaint.

Step 5: Don't skip the medical follow-up if it was severe

If you went to the ER or got tested and they confirmed something — Salmonella, E. coli, etc. — the lab is required to report it to public health. That triggers a separate investigation and is one of the strongest signals the city receives.

What actually happens after a report

The Chicago Department of Public Health logs every food complaint. Patterns get flagged: - Multiple complaints about the same restaurant in a short window - Specific pathogens identified through medical testing - Symptoms consistent with a known foodborne illness pattern

When a pattern is identified, an inspector is dispatched. The inspection is classified as a "Suspected Food Poisoning" inspection or a "Complaint" inspection. These are usually more thorough than canvass inspections — the inspector knows they're looking for something specific.

You can see these inspection types on our site. They're often the most revealing reports.

What you might NOT get

A few realistic expectations: - **You probably won't hear back.** The city investigates but rarely contacts complainants individually about findings. - **The restaurant might not be cited for "what you got sick from."** Foodborne illness investigations are hard. The exact food and exact pathogen often can't be definitively traced. - **Your individual report might not result in a Fail.** But it might trigger an inspection that finds other problems, which result in a Fail.

Why it matters anyway

Even if your case doesn't directly result in a citation, your report becomes part of the data the city uses to decide where to inspect more often. Reporting is one of the few ways the public can directly influence inspection prioritization.

If you got sick and skipped reporting — that data was lost. The next person eating at that restaurant doesn't have it. The city doesn't have it. We don't have it. Reporting is the simplest, lowest-cost thing you can do, and it actually moves the needle.