Flu

 

Influenza (Flu) Treatment in Princeton & Lawrenceville, NJ

Influenza—commonly called the flu—is a contagious viral infection that often causes sudden fever, body aches, fatigue, headache, and cough. Unlike a common cold, the flu typically hits quickly and can leave you feeling significantly run down for days to weeks.

Most healthy adults recover with supportive care. However, some people—especially older adults, young children, pregnant individuals, and those with chronic medical conditions—are at higher risk for complications.

This page explains flu symptoms, how influenza differs from a cold, red flags that need urgent care, and safe return-to-activity guidance—especially for patients in Princeton, Lawrenceville, West Windsor, Plainsboro, Hopewell, Pennington, and Robbinsville.

Quick Takeaways

• Influenza usually begins suddenly with fever and body aches.
• Antibiotics do not treat the flu (it’s viral).
• Antiviral medications may be considered in certain situations.
• Shortness of breath, chest pain, confusion, or worsening symptoms need urgent evaluation.
• Returning to sport too quickly can delay recovery.

At Princeton Sports and Family Medicine, P.C., PSFM Wellness, and Fuse Sports Performance, we don’t believe in guessing your way through training. We believe in building resilient, durable athletes who arrive at race season strong, confident, and healthy. In addition to problem-focused visits, we offer sports performance evaluations to stop problems before they start. Plan your visit today.

WHO THIS AFFECTS + WHY IT HAPPENS

Who This Affects

• Children and adults of all ages
• People exposed in schools, workplaces, or crowded settings
• Athletes during travel or competition season
• Individuals with asthma or chronic lung disease
• Older adults and those with underlying medical conditions

Why Influenza Happens

Influenza viruses infect the respiratory tract and spread via:

• Respiratory droplets
• Close contact
• Contaminated surfaces

The flu typically causes more intense systemic symptoms than a common cold because it triggers a strong immune response.

Risk Factors for Complications

• Age over 65
• Children under 5 (especially under 2)
• Chronic heart or lung disease
• Diabetes or kidney disease
• Pregnancy
• Immunocompromised status
• Asthma or reactive airway disease

SYMPTOMS + WHAT’S NORMAL VS NOT

Typical Flu Symptoms

• Sudden fever
• Chills
• Body aches
• Severe fatigue
• Headache
• Dry cough
• Sore throat
• Nasal congestion (sometimes)
• Reduced appetite

Symptoms usually peak within 2–3 days and gradually improve over 1–2 weeks, though fatigue can linger.

Concerning Symptoms

Seek urgent care if you experience:

• Shortness of breath at rest
• Chest pain or pressure
• Confusion
• Severe weakness
• Persistent high fever
• Blue/gray lips
• Severe dehydration
• Coughing up blood
• Worsening symptoms after initial improvement

Children with rapid breathing, difficulty waking, or dehydration need urgent evaluation.

DIAGNOSIS

What We Assess

• Sudden vs gradual symptom onset
• Fever pattern
• Body aches and fatigue severity
• Exposure history
• Underlying medical conditions
• Breathing symptoms

Physical Exam Focus

• Vital signs
• Lung exam
• Oxygen levels if indicated
• Hydration status

When Testing May Be Considered

• Influenza testing depending on timing and risk profile
• Chest X-ray if pneumonia suspected
• Additional testing in high-risk patients

Testing decisions are individualized based on symptoms and risk.

What to Expect at Your Visit

• Assessment for complications
• Discussion of antiviral treatment eligibility (if early in illness)
• Supportive care guidance
• Clear return-to-activity plan
• Red-flag instructions

TREATMENT OPTIONS

Supportive Care

Helpful

• Rest
• Hydration
• Fever control (as appropriate)
• Nutritious, easy-to-digest foods
• Avoid intense activity

Avoid

• Training with fever
• Dehydration
• Returning to work/school too soon
• Mixing multiple OTC medications without understanding ingredients

Antiviral Medications

In certain cases—especially high-risk individuals or early in illness—clinicians may consider antiviral medications. Timing matters, so early evaluation can be helpful.

Athletes & Recovery

Flu can significantly reduce performance capacity. Consider:

• Complete rest during fever
• Light activity only after fever resolves
• Gradual aerobic return
• Monitoring heart rate and fatigue
• Avoiding maximal intervals early

Medications

OTC medications can help with symptoms, but:

• Check for interactions with blood pressure or other conditions
• Follow dosing limits
• Avoid duplicating ingredients

Procedures / Surgery

Not applicable for routine influenza care.

RETURN TO SPORT / ACTIVITY GUIDANCE

Early Phase (Fever Present)

• No intense exercise
• Focus on hydration and sleep

Mid Phase (Fever Gone, Fatigue Present)

• Light walking
• Easy aerobic activity
• Stop if dizziness or excessive fatigue

Late Phase (Energy Returning)

• Gradual increase in duration
• Add intensity only after several symptom-free days
• Monitor next-day fatigue

Common Mistakes

• Training with fever
• Returning to high-intensity intervals too early
• Ignoring chest symptoms
• Underestimating dehydration
• Skipping sleep during recovery

PREVENTION

• Annual flu vaccination
• Hand hygiene
• Avoid close contact when ill
• Adequate sleep
• Stress management
• Avoid smoke/vaping exposure
• Stay home when febrile
• Support immune health with balanced nutrition

At PSFM Wellness, Fuse Sports Performance and Princeton Sports and Family Medicine, P.C., our professionals specialize in sports medicine services, including sport specific evaluations and training to assess your risk for injury and assist in your performance goals.

FAQs

How long does influenza last?

Most people improve within 7–14 days, but fatigue may last longer.

How is the flu different from a cold?

The flu typically begins suddenly with fever and body aches, while colds are usually milder and gradual.

Do I need antivirals?

They may be considered early in illness or for high-risk individuals.

When can I exercise again?

After fever resolves and energy begins to return. Start light and progress gradually.

Is green mucus bacterial?

Not necessarily. Color alone does not determine infection type.

Can the flu cause pneumonia?

Yes. Worsening breathing symptoms or persistent fever require evaluation.

Should I go to urgent care for flu?

If you have chest pain, shortness of breath, confusion, severe weakness, or worsening symptoms—yes.

I live in Princeton—should I stay home from work?

If febrile or actively symptomatic, staying home helps protect others.

Can influenza trigger asthma?

Yes, viral infections often worsen asthma symptoms.

How can I prevent the flu?

Vaccination, hygiene, sleep, and minimizing exposure reduce risk.

RELATED PAGES

• Upper Respiratory Infection — https://www.princetonmedicine.com/contents/upper-respiratory-infection
• Cough — https://www.princetonmedicine.com/contents/cough
• Bronchitis — https://www.princetonmedicine.com/contents/bronchitis
• Shortness of Breath — https://www.princetonmedicine.com/contents/shortness-of-breath
• Asthma — https://www.princetonmedicine.com/contents/asthma
• Wheezing — https://www.princetonmedicine.com/contents/wheezing
• Sore Throat — https://www.princetonmedicine.com/contents/sore-throat
• Sinusitis — https://www.princetonmedicine.com/contents/sinusitis

CONTACT / BOOKING

Contact Princeton Sports and Family Medicine, P.C., at our Lawrenceville office. Book an appointment online or call us directly to schedule your visit today.”

DISCLAIMER

Educational content only; not medical advice. If you experience severe breathing difficulty, chest pain, confusion, persistent high fever, blue/gray lips, or rapidly worsening symptoms, seek urgent evaluation.