Do I Have the Flu? Symptoms, Testing and When to Visit Urgent Care

What Are the Most Common Flu Symptoms?

Influenza is a contagious respiratory illness caused by influenza viruses. According to the Centers for Disease Control and Prevention (CDC), flu symptoms usually come on suddenly. A person with flu may experience some or all of the following:

• Fever or chills
• Cough
• Sore throat
• Stuffy or runny nose
• Body aches
• Headache
• Fatigue or weakness
• Vomiting or diarrhea

Vomiting and diarrhea are more common in children than adults. A fever is common with flu, but it is not required—you can have influenza without developing a measurable fever.

Many people recover within several days to less than two weeks. Others develop complications such as pneumonia, sinus or ear infections, worsening asthma, or worsening of another chronic condition. Seek medical advice when symptoms are severe, persistent, worsening or concerning.

Flu, a Cold, COVID-19 or RSV: Can Symptoms Tell the Difference?

Flu, COVID-19, RSV and the common cold can all cause cough, sore throat, congestion, fatigue and fever. General symptom patterns may provide clues, but they cannot reliably identify the virus.

Important: This table describes common patterns, not a diagnostic test. A clinician may recommend testing when multiple viruses are circulating, the result could affect treatment, or the patient is at higher risk of complications.

Which Level of Care May Be Appropriate?

When Should You Visit Urgent Care for Flu-Like Symptoms?

Urgent care may be appropriate when symptoms are uncomfortable or worsening but do not appear life-threatening. Consider a same-day evaluation when:

• Your symptoms are significant, persistent or getting worse
• A fever or cough improves and then returns or worsens
• You are having difficulty drinking enough fluids but do not have signs of severe dehydration
• You are concerned about a child’s fever, breathing, hydration or behavior
• You are pregnant, 65 or older, immunocompromised or living with a chronic medical condition
• Symptoms began recently and you want to ask whether a prescription antiviral may be appropriate
• You need evaluation or testing to distinguish flu from another respiratory infection
• You are unsure whether urgent care or emergency care is the safer choice

Who Is at Higher Risk for Flu Complications?

Anyone can become seriously ill from flu, but some people have a higher risk of complications. The CDC recommends prompt medical advice and early antiviral treatment for higher-risk people with suspected or confirmed influenza.

• Adults 65 and older
• Children younger than 5, especially those younger than 2
• Pregnant people and those within two weeks after the end of pregnancy
• People with asthma, COPD or another chronic lung condition
• People with heart disease, diabetes, kidney disease, liver disease or certain neurologic conditions
• People with weakened immune systems
• People with certain blood or metabolic disorders
• People with severe obesity
• People living in nursing homes or other long-term-care facilities
• Anyone with severe, complicated or progressively worsening illness

What Happens During an Urgent Care Visit for Possible Flu?

1. Medical history and symptom review. A clinician may ask when symptoms began, whether they started suddenly, which symptoms are present, whether someone around you has been sick, and whether you have risk factors for complications.
2. Physical examination. The visit may include checking your temperature and other vital signs and assessing your breathing, hydration and overall condition.
3. Testing decision. The clinician may recommend a flu test or a combination respiratory test if the result could help guide treatment or precautions.
4. Treatment and follow-up plan. You may receive home-care guidance, a prescription when medically appropriate, warning signs to monitor and instructions for follow-up.

How Does Flu Testing Work?

Several types of tests can detect influenza. The best choice depends on what is available and how the result will be used.

Not everyone with flu-like symptoms needs a test. The decision depends on the patient’s risk factors, illness severity, timing and whether the result would change treatment.

Can Urgent Care Treat the Flu?

Many people with mild influenza recover with rest, fluids and symptom management. A clinician can assess whether additional treatment or follow-up is appropriate and may check for complications or another cause of the symptoms.

Prescription Antiviral Medication

Flu antivirals are prescription medications that act against influenza viruses. They work best when started within one to two days after symptoms begin. Early treatment is especially important for people who are hospitalized, severely ill or at higher risk of complications.

Higher-risk patients should seek medical advice promptly rather than waiting for symptoms to become severe. Treatment may sometimes be started for suspected flu without waiting for laboratory confirmation. The appropriate medication depends on factors such as age, pregnancy, underlying conditions, illness severity and time since symptoms began.

Antibiotics Do Not Treat Influenza

Antibiotics treat bacterial infections, not influenza viruses. They are not used to treat uncomplicated flu. A clinician may prescribe an antibiotic if there is evidence of a secondary bacterial infection.

What Can You Do While Recovering at Home?

If a clinician says home care is appropriate:

• Rest and drink fluids as tolerated
• Follow the treatment plan you received
• Use over-the-counter medicine only as directed and ask a clinician or pharmacist when you are unsure
• Do not give aspirin or salicylate-containing products to children or teenagers with suspected flu unless specifically directed by a qualified clinician
• Cover coughs and sneezes and wash your hands regularly
• Improve indoor airflow when practical
• Avoid close contact with people at higher risk of severe illness
• Seek reevaluation if symptoms worsen or improve and then return

Does the 2026–27 Flu Vaccine Still Help?

The seasonal flu vaccine remains an important tool for reducing influenza and serious complications. The 2026–27 vaccine composition was updated from the previous season to target the influenza viruses expected to circulate.

Flu vaccination does not treat an illness you already have, and protection takes time to develop. Ask a qualified healthcare professional which vaccine is appropriate for you or your child. CDC guidance recommends continuing vaccination while flu viruses are circulating and vaccine remains available.

Flu Testing and Same-Day Care in Stockton, Lodi, Manteca and Modesto

California Urgent Care Center provides walk-in and same-day care for many non-life-threatening respiratory illnesses at five locations serving San Joaquin and Stanislaus Counties:

• Lodi
• Stockton–Lorraine
• Stockton–Pershing
• Manteca
• Modesto

The website currently lists rapid flu, RSV and COVID-19 testing at all five clinics and says no appointment is required. All locations are listed as open seven days a week from 9:00 a.m. to 9:00 p.m. Hours, test availability and services can change, so check your preferred location before visiting when timing or a specific test matters.

Walk in for stable, non-emergency flu-like symptoms or register online to save your spot. Call 911 or go to an emergency department for severe breathing trouble, persistent chest pain or pressure, confusion, seizures, severe dehydration, inability to awaken or another potentially life-threatening symptom.

Frequently Asked Questions