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Flu vs. Cold: How Can You Tell?

Sudden vs gradual onset, fever, body aches, and when testing at urgent care helps.

Colds and flu are both respiratory illnesses, but they are caused by different viruses and often feel different.

Onset: Flu typically starts suddenly — you may feel fine in the morning and quite ill by evening. Colds usually build gradually over a day or two.

Fever and body aches: Moderate to high fever and significant body aches are more common with flu. Colds may cause mild fatigue but less intense systemic symptoms.

Head and chest symptoms: Colds often center on the nose and throat — congestion, runny nose, and sneezing. Flu adds more whole-body symptoms even when cough and sore throat are present.

Duration: Colds often peak within a few days and resolve in 7–10 days. Flu can leave you feeling exhausted for one to two weeks.

Why testing matters: When you are unsure or need treatment guidance (such as antivirals for flu), rapid testing during an urgent care visit can help.

When to seek care: Consider NeuMed if symptoms are severe, last beyond 10 days, or you are in a higher-risk group. Walk in or save your spot online for cold and flu evaluation in Houston.

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