Symptoms

Fever

Fever is a sign your body is fighting illness. Learn common causes, when urgent care can help, and emergency warning signs — including guidance for children.

Possible causes

What qualifies as a fever: A fever is generally a body temperature of 100.4°F (38°C) or higher when measured orally, rectally, or by another reliable method. Context matters — the same number can mean different things in infants, children, and adults.

Staying hydrated with fever: Fever increases fluid loss through sweating. Drink water or electrolyte fluids regularly, and watch for signs of dehydration — dry mouth, reduced urination, dizziness, or inability to keep fluids down. Seek prompt care if dehydration is a concern.

Fever itself is not a diagnosis — it signals an underlying issue. Common causes include:

  • Viral infections (cold, flu, COVID-19, RSV)
  • Bacterial infections (strep throat, ear infection, UTI, pneumonia)
  • Inflammatory or immune responses
  • Heat exhaustion (environmental)
  • Recent vaccinations (mild, short-lived fever can be normal)

Commonly associated symptoms

Depending on the cause, fever may occur with:

  • Chills or sweating
  • Body aches and fatigue
  • Sore throat, cough, or congestion
  • Headache
  • Nausea or vomiting
  • Ear pain or painful urination (suggesting a localized infection)

When urgent care may be appropriate

When urgent care may help: Consider evaluation if fever lasts more than a few days, is accompanied by significant symptoms, or you need testing to identify the cause (flu, COVID-19, strep, or other infections).

How NeuMed evaluates fever: A provider reviews your history and exam, then may recommend rapid testing when clinically appropriate — often during the same visit at Houston-area clinics.

Testing options: Rapid flu, strep, and COVID-19 tests may be available depending on your symptoms. Results timing varies by test type and clinic workflow.

Treatment depends on diagnosis: Viral illnesses are usually managed with rest, fluids, and symptom relief. Bacterial infections may need antibiotics. Antivirals for flu may be considered when started early and clinically appropriate.

Pediatric considerations: Infants under 3 months with any fever need emergency care — not urgent care. For older children, seek prompt evaluation for persistent high fever, dehydration, breathing difficulty, or if your child appears very ill. NeuMed treats children 6 months and older.

When to seek emergency care

Call 911 or go to the emergency room for:

Difficulty breathing or blue lips/face

Severe chest pain or confusion

Stiff neck with fever and severe headache

Signs of severe dehydration (no urination, dizziness, lethargy)

Seizure with fever

Any fever in an infant under 3 months old

FAQs

What temperature counts as a fever?

A fever is generally considered a body temperature of 100.4°F (38°C) or higher. Context matters — the same number can mean different things in infants, children, and adults.

Should I go to urgent care for a fever?

Consider urgent care when fever is persistent, very high, accompanied by concerning symptoms, or you are unsure whether emergency care is needed. Infants under 3 months with any fever need emergency evaluation.

Can NeuMed test for flu or COVID with a fever?

Yes. When clinically appropriate, NeuMed can perform rapid flu, strep, and COVID-19 testing during your visit at Houston-area clinics.

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