Cold and flu symptoms can be quite similar, especially during the first few days when you just feel run-down and you’re unsure what’s going on. While a cold is usually manageable at home, the flu can take a different course and lead to serious complications for some people.
When you or someone you care for is feeling ill, understanding cold vs. flu emergency symptoms and when they pose a risk can help you make better care decisions. This guide explains how to tell the two apart, what flu emergency warning signs to watch for, when to go to the ER for flu symptoms and where you can find emergency care in the Dallas-Fort Worth Metroplex.
Understanding the Difference Between a Cold and the Flu
Both the common cold and the flu are contagious respiratory illnesses, but they come from different viruses and affect the body differently. A cold can start from a variety of viruses, usually rhinoviruses. Influenza viruses typically cause a more widespread illness and are more likely to lead to serious complications.
That’s one reason why the flu often feels much worse than a cold. Cold viruses typically stay in the upper airways, so symptoms tend to be milder and more manageable. Another important difference is how the symptoms develop. Cold symptoms tend to appear gradually, while flu symptoms often come on suddenly.
Cold vs. Flu Symptoms
Determining whether your symptoms are more consistent with a cold or the flu can help you decide how closely to monitor them.
Typical cold symptoms include:
- Onset over a day or two
- Runny or blocked nose
- Sneezing
- Mild cough
- Sore throat
- Mild fever, usually the case for children
- Mild body aches or headache
Flu symptoms may include:
- Sudden onset of fever or chills
- Significant fatigue
- Muscle or body aches
- Headache
- Cough
- Sore throat
- Vomiting or diarrhea, particularly in children
Not everyone with the flu develops a fever, so the absence of one doesn’t rule it out. Most colds improve within 7–10 days, although coughs can sometimes last longer. Flu symptoms can last for one to two weeks, with fatigue sometimes lingering even longer. Because illnesses such as the flu, RSV, COVID-19 and the common cold can cause similar symptoms, testing may be helpful when symptoms overlap or if you’re at higher risk for complications.
Flu Complications That Can Become Emergencies
Most people recover from the flu at home, but for some, the illness can progress into a far more serious condition, such as worsening asthma, inflammation of the heart or brain, respiratory failure, kidney failure or sepsis. One important warning sign is when symptoms seem to improve and then suddenly get worse again, with a returning fever and a more severe cough. This may indicate that a secondary complication, such as bacterial pneumonia, has developed after the original flu infection.
People most at risk for serious flu complications include adults 65 and older, children younger than 5, pregnant women and anyone living with asthma, heart disease, diabetes or a weakened immune system. If you or someone in your care falls into one of these groups, it’s especially important to pay close attention to how symptoms are progressing.
When To Visit the ER
One of the most significant takeaways of this guide is knowing when your cold or flu symptoms constitute an emergency and when you can manage them at home.
For Flu Symptoms
Adults should seek emergency care right away for these flu symptoms:
- Difficulty breathing or shortness of breath
- Persistent chest or abdominal pain or pressure
- Confusion or inability to wake or stay awake
- Persistent dizziness
- Seizures
- Severe muscle pain or weakness
- No urination
For children, warning signs that require prompt emergency attention include:
- Fast or labored breathing
- Bluish lips or face
- Ribs visibly pulling in with each breath
- Chest pain
- Refusing to walk due to muscle pain
- Signs of dehydration, such as no urination for eight hours, dry mouth or lack of tears when crying
- Unusual sleepiness or difficulty staying alert
- Seizures
- Fever above 104 degrees Fahrenheit that does not come down with fever-reducing medicine
- Any fever in a baby younger than 12 weeks
For Cold Symptoms
Similarly, worsening cold symptoms may require a visit to the ER.
For adults and older children, these symptoms include:
- Trouble breathing
- Chest pain
- Confusion
- High fever with severe illness
- Severe dehydration
- Blue lips
- Symptoms of sepsis
For babies and young children, watch for these:
- High fever
- Vomiting or refusal to eat
- Ear or stomach pain
- Excessive crying
- Unusual sleepiness
- Wheezing or trouble breathing
You can explore our hospital services and inpatient care options at Baylor Scott & White Emergency Hospitals to understand what levels of care are available when you need more than home management.
What To Expect in the ER for Cold or Flu Complications
Going to the ER when you feel seriously ill can be stressful, so it’s helpful to know what to expect. After you arrive and complete triage, the care team will check your vital signs, oxygen levels and breathing. A physician will ask you about your symptoms, how long you’ve been ill, whether you have any chronic medical conditions, your medications, your allergies and possible exposures.
Depending on your symptoms, testing may include screening for influenza, RSV or COVID-19. If the care team suspects a more serious infection, dehydration or complication, they may order blood tests or a chest X-ray. In some cases, additional imaging, such as a CT scan, may be recommended if physicians need a closer look at possible complications or another underlying condition. Treatment may include IV fluids, breathing support, fever management and medications based on your diagnosis.
Baylor Scott & White Emergency Hospitals offer on-site diagnostic services, including laboratory testing and imaging, as part of emergency care for ER patients and inpatients. Board-certified, emergency-trained physicians are on-site 24/7, and the average doctor wait time is under 10 minutes.
Get Emergency Care for Cold or Flu Complications in the Dallas-Fort Worth Metroplex
If you or someone you care for has cold or flu symptoms accompanied by difficulty breathing, persistent chest pain, confusion, symptoms that worsen after briefly improving or other emergency warning signs, call 911 or go to the nearest ER right away. Baylor Scott & White Emergency Hospitals provide 24/7 emergency care with board-certified, emergency-trained physicians at eight locations throughout the Dallas-Fort Worth Metroplex.