How Long Should a Fever Last Before I Go to a Walk-In Clinic?

Many short-term fevers improve within a few days, but duration is only one factor in deciding whether to seek medical care. The temperature, accompanying symptoms, hydration, medical history, and whether you are improving also matter. An adult fever lasting longer than 48 to 72 hours generally deserves a call to a healthcare provider. Seek advice sooner if the fever is high, symptoms are worsening, or you have an increased risk of complications. This article focuses primarily on adults. Infants and children require age-specific medical guidance.

How long does a typical fever last?

A fever caused by a short respiratory illness may last a few days, but there is no single duration that applies to every person or every cause.

For example, the CDC reports that fever associated with influenza commonly lasts about three to four days. Other viral infections, bacterial infections, medication reactions, inflammatory conditions, and heat-related illness can follow different patterns. A fever is a symptom rather than a diagnosis, so how long a fever lasts depends on what is causing it. (CDC)

While monitoring a fever, record:

• The highest temperature
• How and when it was measured
• When the fever began
• Whether it comes and goes
• Other symptoms
• Whether you can drink fluids and urinate normally
• Whether the illness is improving or worsening

A fever that is gradually resolving along with the rest of a mild illness may be monitored. A fever that remains elevated, repeatedly returns, or accompanies worsening symptoms should be discussed with a provider.

For more information about temperature levels, read how high a fever should be before seeing a doctor.

When should a persistent fever be checked by a doctor?

An adult fever lasting longer than 48 to 72 hours should generally be checked by a healthcare provider. You should also contact a provider when the fever repeatedly returns over several days, even if the temperature is not especially high.

MedlinePlus advises adults to contact a medical professional when a fever continues for more than 48 to 72 hours, stays at or rises above 103°F, or comes and goes for a week or longer. (MedlinePlus)

A fever lasting more than three days does not automatically identify the cause. A provider may need to consider respiratory symptoms, urinary symptoms, abdominal concerns, rashes, recent travel, medications, exposures, and chronic health conditions.

Contact a provider sooner if you develop:

• Increasing weakness
• Difficulty drinking or keeping fluids down
• Reduced or dark urine
• A new rash or unexplained bruising
• Painful urination
• A worsening cough or wheezing
• Symptoms that improve and then return more severely

Learn what an assessment may involve under how a clinic finds the cause of fever.

Who should seek care sooner for an ongoing fever?

A high-risk patient with fever should contact a healthcare provider promptly rather than automatically waiting two or three days.

People who may face a greater risk of severe respiratory illness include:

• Adults age 65 and older
• Pregnant patients
• People with weakened immune systems
• People with asthma or chronic lung disease
• People with diabetes, heart disease, or kidney disease
• People whose underlying condition worsens during the illness

The CDC identifies older adults, pregnant people, young children, people with weakened immune systems, and those with certain medical conditions as groups more likely to become seriously ill from respiratory viruses. (CDC)

This article’s adult guidance should not be applied to babies or young children. Any fever in an infant younger than 12 weeks requires immediate medical attention, and older children also have age-specific thresholds. (CDC)

For an overview of non-emergency fever care, see fever doctor and same-day evaluation.

When should a fever go to urgent care or the emergency room?

A fever should go to emergency care when it occurs with signs that breathing, circulation, hydration, or mental alertness may be seriously affected.

Persistent fever emergency signs include:

• Severe difficulty breathing or shortness of breath
• Persistent chest or abdominal pain or pressure
• Confusion, inability to wake, or fainting
• Seizures
• Blue, gray, or unusually pale lips or skin
• No urination
• Severe weakness or unsteadiness
• A severe headache with a stiff neck
• Fever or cough that improves and then returns worse

The CDC identifies breathing difficulty, chest pressure, confusion, seizures, lack of urination, severe weakness, and symptoms that return worse as emergency warning signs of respiratory illness complications. MedlinePlus also recommends emergency help for severe shortness of breath, fainting, sudden confusion, seizures, or high fever with a severe headache and stiff neck. (CDC)

Las Caritas is not an emergency room. Call 911 or go to the nearest emergency department for potentially life-threatening symptoms.

Ask About a Persistent Fever Evaluation

For a non-emergency fever lasting longer than expected, call Las Caritas Walk In Clinic and Family Medicine to ask whether a same-day evaluation may be appropriate. Walk-ins are accepted based on availability, and same-day appointments may be available when scheduling permits. Calling ahead is recommended. (Las Caritas Walk In Clinic)

Review walk-in clinic and same-day visits or use contact Las Caritas to ask about current availability. Testing, diagnosis, and treatment depend on the provider’s evaluation and the services available.