You can get a doctor’s note for a stomach bug when a licensed provider reviews your symptoms, such as vomiting, diarrhea, nausea, or stomach cramps, and finds that you need time away from work or school. The note documents what the provider found, but your employer or school decides how to handle the absence. Because a stomach bug can still spread for days after you feel better, knowing when to stay home and when to go back helps you ask for the right dates.
Key takeaways
- Norovirus, the most common cause of stomach bugs in the U.S., causes 19 to 21 million illnesses a year, and most people feel better within 1 to 3 days.
- A doctor’s note for a stomach bug lists the dates you should be out based on a provider’s review of your symptoms, and your employer or school makes the final decision.
- The CDC recommends staying home for at least 2 days (48 hours) after vomiting and diarrhea stop, so plan your return date with that in mind.
Can you get a doctor’s note for a stomach bug?
Yes, if a provider finds that your symptoms make it reasonable to stay home. A stomach bug (viral gastroenteritis, an infection that inflames the stomach and intestines) usually gets better on its own with rest and fluids, which is why many people recover at home without an office visit.
If your symptoms are mild and you’re recovering at home, a note can confirm that you were evaluated and needed time off. If your symptoms suggest dehydration or something more serious, the provider may decline a note and recommend in-person care instead.
Since the right dates depend on how long you’re sick and contagious, it helps to understand what’s behind the illness.
What causes a stomach bug?
Most stomach bugs are caused by viruses, and norovirus is the most common. According to the Centers for Disease Control and Prevention (CDC), norovirus is the leading cause of vomiting, diarrhea, and foodborne illness in the United States. It’s sometimes called the “stomach flu,” but it isn’t related to influenza.
Common causes of a sudden stomach illness include:
- Norovirus: Spreads through close contact, contaminated food or drinks, and contaminated surfaces. The CDC estimates it causes 19 to 21 million illnesses each year.
- Other viruses: The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) lists rotavirus, adenovirus, and astrovirus, which can last longer than norovirus.
- Food poisoning: Bacteria, viruses, or toxins in food can cause similar symptoms, including diarrhea, stomach cramps, nausea, vomiting, and fever.
A provider reviewing your request doesn’t always need to pin down the exact cause to decide whether you should stay home.
How long does a stomach bug last?
Most stomach bugs caused by norovirus can last 1 to 3 days. Symptoms usually start 12 to 48 hours after exposure, according to the CDC, and can include vomiting, diarrhea, nausea, and stomach pain, sometimes with fever, headache, or body aches. A study of norovirus outbreaks in English hospitals and nursing homes found that staff and nursing home residents were sick for a median of 2 days, and 75% recovered fully within 3 days. Hospital patients were sick longer, for a median of 3 days.
Other causes can last longer. NIDDK notes that rotavirus symptoms typically last 3 to 8 days, and adenovirus can last 1 to 2 weeks.
You may stay contagious after you feel better. In a study of adults infected with Norwalk virus, a type of norovirus, symptoms lasted 1 to 2 days, but the virus was detected in stool for a median of 28 days. The CDC notes that you can spread norovirus for 2 weeks or more after you feel better, which is why handwashing still matters after you return.
How can you recover and avoid spreading a stomach bug?
Most people recover at home with rest, fluids, and careful hygiene. NIDDK’s treatment guidance and the CDC suggest these steps:
- Sip fluids often: If vomiting is a problem, try small sips of clear liquids such as water, broth, or sports drinks.
- Use an oral rehydration solution if needed: NIDDK recommends these drinks for adults with severe diarrhea or signs of dehydration.
- Eat when you’re ready: NIDDK notes that research hasn’t found a restricted diet helpful, so you can usually return to your normal diet once your appetite comes back.
- Check before using diarrhea medicine: NIDDK advises against over-the-counter diarrhea medicines if you have bloody diarrhea or a fever, and recommends seeing a doctor instead.
- Wash your hands and clean surfaces: Washing with soap and water is the best way to remove germs, especially after using the toilet. The CDC also recommends disinfecting areas soiled by vomit or diarrhea with a chlorine bleach solution and leaving it on for at least 5 minutes.
Antibiotics don’t treat viral stomach bugs, so most people don’t need a prescription to recover.
When can you go back to work or school after a stomach bug?
The CDC recommends staying home for at least 2 days (48 hours) after your symptoms stop. That gives your body time to recover and lowers the chance of spreading the virus to coworkers or classmates.
A few groups should be especially careful:
- Food workers: The CDC’s norovirus guidance for food workers says to stay home while sick and for at least 48 hours after symptoms stop, and to tell your manager about your symptoms.
- Caregivers and health care workers: The CDC advises against preparing food or caring for others until at least 48 hours after symptoms stop.
- Students and parents: Many schools and child care programs have their own rules for vomiting and diarrhea, so check the policy before sending a child back.
When you return, wash your hands often with soap and water. The CDC notes that hand sanitizer isn’t a substitute for handwashing against norovirus. Your employer’s policy may also set its own return rules, so follow those if they’re stricter.
What a doctor’s note for a stomach bug includes
A doctor’s note typically confirms that you were evaluated, lists the dates you should be out, and gives a return date. It doesn’t always need to name your diagnosis.
Employers can generally ask for notes. The Equal Employment Opportunity Commission (EEOC) states that an employer may require a doctor’s note to justify sick leave, as long as it requires notes from all employees. Some state and local sick leave laws limit when notes can be required, so check your employee handbook.
A note supports your request, but it doesn’t mean your absence will automatically be excused. The guide to a doctor’s note for work explains what employers usually look for.
How to get a doctor’s note for a stomach bug online
If you’re recovering from a mild illness at home, or you’re a parent or guardian requesting a note for a child under 18, getting a note online takes a few steps:
- Check your policy. Find out whether your employer or school needs a note and what it should include.
- Submit your symptoms. Complete a short online form describing your vomiting, diarrhea, and other symptoms, including when they started.
- Have a physician review it. A board-certified physician decides whether a note is appropriate, and a request can be declined.
- Receive and share your note. Download it from the secure portal and send it to your manager, HR, or school.
A board-certified physician can review your request for an online doctor’s note for work without an appointment. Notes can cover up to 5 days in a 30-day period, starting as early as 2 days before you submit your request, and the practice will verify a note if your employer calls. If you need a note for a child’s absence, the page on a doctor’s note for school explains what schools usually accept. The guide on how to get a doctor’s note online walks through what to have ready before you submit.
When to seek medical attention
Most stomach bugs improve with rest and fluids, but dehydration (losing more fluid than you take in) is the main risk, especially for young children, older adults, and people with other health conditions. The CDC lists these signs of dehydration:
- Peeing less than usual
- A dry mouth and throat
- Feeling dizzy when you stand up
- In children, crying with few or no tears or unusual sleepiness or fussiness
The CDC also recommends seeing a doctor if you have bloody diarrhea, diarrhea lasting more than 3 days, a fever above 102°F, or vomiting so often that you can’t keep liquids down. NIDDK adds severe stomach or rectal pain, black or tarry stools, and a change in mental state as reasons to get care right away. If your symptoms are lasting longer than expected, an online urgent care visit can help you decide on next steps.
This is not an emergency service. If you have signs of severe dehydration, confusion, severe stomach pain, or another emergency, call 911 or go to the nearest emergency room.
Frequently asked questions
How many days off should you take for a stomach bug?
It depends on how long your symptoms last. Many people are sick for 1 to 3 days, and the CDC recommends staying home for at least 48 hours after symptoms stop, so your time off may run a few days longer than the illness itself.
Can you get a doctor’s note for food poisoning?
Yes, if a provider finds that your symptoms justify time off. Food poisoning and viral stomach bugs cause similar symptoms, and the provider reviews how severe they are and how long they’ve lasted.
Can a doctor’s note cover days you already missed?
Within limits. A note from My Dr’s Note can start up to 2 days before you submit a request, and the dates must match your reported symptoms.
Should you go to work if you only have diarrhea?
Usually not. Diarrhea alone can still spread norovirus and other infections, especially if you handle food or care for others. The CDC’s 48-hour guidance applies after both vomiting and diarrhea have stopped.
Does the note say what illness you have?
Not always. Many notes simply confirm that you were evaluated and should be excused for specific dates. Ask your employer what information its policy requires.
Get a doctor’s note for your stomach bug
If you’re recovering from a stomach bug and a mild illness at home and can’t get a timely appointment, My Dr’s Note can help. A board-certified physician reviews your symptoms, approved notes are often delivered within 1 to 2 hours, and you’re only charged if your request is approved. Get started now; current pricing is shown on the booking page.
Sources
- Centers for Disease Control and Prevention. Updated April 24, 2024. About Norovirus. https://www.cdc.gov/norovirus/about/index.html
- Centers for Disease Control and Prevention. Updated May 8, 2024. Norovirus Facts and Stats. https://www.cdc.gov/norovirus/data-research/index.html
- Centers for Disease Control and Prevention. Updated January 13, 2025. How to Prevent Norovirus. https://www.cdc.gov/norovirus/prevention/index.html
- Centers for Disease Control and Prevention. Updated May 8, 2024. Norovirus Fact Sheet for Food Workers. https://www.cdc.gov/norovirus/communication-resources/facts-for-food-workers.html
- Centers for Disease Control and Prevention. Updated November 24, 2025. Food Poisoning Symptoms. https://www.cdc.gov/food-safety/signs-symptoms/index.html
- National Institute of Diabetes and Digestive and Kidney Diseases. Reviewed May 2018. Symptoms & Causes of Viral Gastroenteritis (“Stomach Flu”). https://www.niddk.nih.gov/health-information/digestive-diseases/viral-gastroenteritis/symptoms-causes
- National Institute of Diabetes and Digestive and Kidney Diseases. Reviewed May 2018. Treatment of Viral Gastroenteritis (“Stomach Flu”). https://www.niddk.nih.gov/health-information/digestive-diseases/viral-gastroenteritis/treatment
- Centers for Disease Control and Prevention. Updated February 16, 2024. About Handwashing. https://www.cdc.gov/clean-hands/about/index.html
- Atmar RL, Opekun AR, Gilger MA, et al. Norwalk virus shedding after experimental human infection. Emerg Infect Dis. 2008;14(10):1553-1557. doi:10.3201/eid1410.080117. https://pubmed.ncbi.nlm.nih.gov/18826818/
- Lopman BA, Reacher MH, Vipond IB, Sarangi J, Brown DWG. Clinical manifestation of norovirus gastroenteritis in health care settings. Clin Infect Dis. 2004;39(3):318-324. doi:10.1086/421948. https://pubmed.ncbi.nlm.nih.gov/15306997/
- U.S. Equal Employment Opportunity Commission. Issued July 26, 2000. Enforcement Guidance on Disability-Related Inquiries and Medical Examinations of Employees under the ADA. https://www.eeoc.gov/laws/guidance/enforcement-guidance-disability-related-inquiries-and-medical-examinations-employees
Medical documentation supports your request but does not guarantee approval. Final decisions are made by your employer, insurance carrier, leave administrator, school, or applicable state program.
This article is for informational purposes only and is not a substitute for professional medical advice.
This is not an emergency service. In an emergency, call 911 or go to the nearest emergency room.