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Is It the Flu or Just a Cold? Here’s How to Tell

Nov 04, 2025
Is It the Flu or Just a Cold? Here’s How to Tell
With cold and flu season upon us, it’s easy to mistake one for the other. Knowing the difference can help you get proper care. Here, we explain the key distinctions and when your symptoms require medical attention.

As the thermometer dips, respiratory illnesses rise. But how can you tell if you have a common cold or the more serious flu? Understanding the differences is crucial to managing your symptoms and receiving the appropriate care.

At Mederi Urgent Care, our team of primary care physicians in Los Angeles and Glendale, California, is committed to helping you and your family stay healthy. In this blog, they explain how to differentiate between flu and cold symptoms, the first step on your road to recovery.

Symptom onset and severity

One of the most significant differences between a cold and the flu is how quickly symptoms appear. A cold tends to come on gradually over a few days. You might first notice a tickle in your throat, followed by a runny or stuffy nose. 

The flu, on the other hand, hits you suddenly and with more intensity. You can feel fine one moment and be hit with a wave of fever, aches, and exhaustion the next.

Key differences in symptoms

Both illnesses share some symptoms, but there are clear distinctions to help you tell them apart. Our team at Mederi Urgent Care recommends treatment based on your condition.

Fever

A cold rarely causes a fever above 100°F. With the flu, a fever of 100°F or higher is common and can last for several days.

Aches and pains

Severe muscle and body aches are hallmarks of the flu. While you might have mild discomfort with a cold, the flu can cause significant pain.

Cough

A cold typically produces a hacking, productive cough with mucus. The flu is more often associated with a dry, nonproductive cough.

Headache

Headaches are common and can be severe with the flu. They’re rare with a cold, unless your congestion turns into a sinus infection.

Fatigue

While a cold might make you feel a bit tired, the flu can cause extreme exhaustion that lasts for weeks.

When to seek medical care

Most colds are mild and typically resolve on their own within 7-10 days. However, the flu can lead to serious complications, such as pneumonia, especially in young children, older adults, and individuals with chronic health conditions.

If you suspect you have the flu, it’s essential to get tested and start treatment as soon as possible. Antiviral medications are most effective when taken within the first 48 hours of symptoms.

If you’re experiencing severe symptoms, have a high fever, or are in a high-risk group, don’t wait. Call the Mederi Urgent Care office nearest you or request an appointment online today.