If you live in or love visiting the American Southwest, you probably expect dust,
sun, and the occasional tumbleweed. You might not expect a fungus floating in that dust
that can sneak into your lungs and make you feel like you’ve caught the worst flu of your life.
That “dusty flu” has a name: Valley fever, also called
coccidioidomycosis.

Valley fever is a lung infection caused by a soil-dwelling fungus called
Coccidioides. Most people never realize they inhaled it. Others deal with weeks
or months of coughing, fatigue, fever, and joint pain. In a small number of cases, the
infection spreads beyond the lungs and becomes serious or even life-threatening. The good
news: we understand this condition better than ever, and there are effective treatments for
people who need them.

In this in-depth guide, you’ll learn what causes Valley fever, how it spreads, who’s at
higher risk, how it’s diagnosed, and the current treatment options. We’ll also walk through
real-life experiences and practical tips to help you or someone you love navigate this
infection with less fear and more confidence.

What is Valley fever?

Valley fever is an infection caused by inhaling spores from the fungus
Coccidioides immitis or Coccidioides posadasii. These fungi live in dry,
dusty soil. When that soil is disturbed by wind, construction, farming, or even off-road
recreation, tiny fungal spores can become airborne. If you breathe them in, they can settle
in your lungs and trigger an infection.

You may also hear Valley fever called:

• San Joaquin Valley fever
• Desert fever
• Desert rheumatism
• Coccidioidomycosis (the official medical name)

In most people, the immune system takes care of the fungus with little drama.
But for others, especially those with weakened immune systems, the infection can become
prolonged, severe, or spread beyond the lungs.

Where does Valley fever occur, and who is at risk?

Valley fever is most common in specific regions, especially:

• Arizona (especially around Phoenix and Tucson)
• California’s Central Valley and parts of Southern California
• South-central Washington state
• Parts of Nevada, New Mexico, Texas, and Utah
• Certain areas of Mexico, Central America, and South America

Simply living in or traveling through these areas can expose you to
Coccidioides spores. However, some people are more likely to develop severe disease:

• Adults over 60
• People with weakened immune systems (HIV/AIDS, cancer treatment, organ transplant, long-term high-dose steroids, certain autoimmune medications)
• Pregnant people, especially in the third trimester
• People with diabetes or chronic lung or heart disease
• People of African or Filipino descent (who have a higher risk of disseminated disease)
• Workers exposed to dust (construction, farm work, military training, archaeology, prison labor in endemic areas)

Importantly, Valley fever is not contagious. You cannot catch it by
standing next to someone who has it or sharing drinks with them. The infection comes from
the environment, not from other people or animals.

How do you get Valley fever? (Causes and transmission)

The cause of Valley fever is straightforward: you inhale fungal spores. The details, however,
are where public health and climate trends come into play.

The Coccidioides fungus thrives in dry, sandy, or dusty soils that experience
cycles of wet and dry weather. When conditions are just right, the fungal networks in the soil
form tiny spores called arthroconidia. When the soil is disturbed, those spores become airborne.

Common ways spores get into the air include:

• Strong winds or dust storms
• Construction, digging, or farming activities
• Driving on dirt roads or off-roading
• Military training exercises
• Earthquakes or landslides in endemic areas

Once inhaled, spores travel down the airways into the lungs. There, they transform into
larger structures called spherules that grow and release more fungal particles, triggering
inflammation and symptoms. For many people, the immune system contains the infection and
creates lasting immunity. For others, the fungus persists or spreads beyond the lungs to the
skin, bones, joints, or brain.

Symptoms: when a “dusty cold” is more than a cold

One of the challenges with Valley fever is that its symptoms can look a lot like other
common illnesses, especially the flu or pneumonia. Some people never develop noticeable
symptoms at all.

Common mild to moderate symptoms

Symptoms usually show up 1 to 3 weeks after breathing in the spores and may include:

• Fever and chills
• Cough (often dry at first, sometimes productive)
• Chest pain or discomfort when breathing deeply
• Shortness of breath
• Fatigue that feels way out of proportion to your activity level
• Headache and muscle aches
• Night sweats
• Joint pain and stiffness
• Red, tender bumps on the shins or other parts of the body (erythema nodosum)

That classic combination of fever, joint pain, and painful skin nodules is sometimes called
“desert rheumatism.” Many people with this pattern eventually improve without needing
antifungal drugs, although it may take weeks or months to feel truly normal again.

Severe or disseminated Valley fever

In a small percentage of people, the fungus spreads outside the lungs. This is called
disseminated coccidioidomycosis and is a medical emergency. Symptoms depend on the organs
involved and may include:

• Persistent or worsening cough with weight loss
• Severe chest pain or difficulty breathing
• Skin lesions that may look like ulcers, nodules, or warty growths
• Joint swelling and significant pain
• Bone pain
• Severe headaches, neck stiffness, light sensitivity, or confusion (signs of meningitis)

If Valley fever affects the brain lining (coccidioidal meningitis), long-term antifungal
treatment is usually required and sometimes continues for life.

How is Valley fever diagnosed?

Because Valley fever mimics other respiratory infections, it can be missed or misdiagnosed
if healthcare professionals don’t consider it. Diagnosis generally combines:

• Medical history and physical exam: recent travel or residence in endemic areas, exposure to dust, and a pattern of persistent flu-like symptoms raise suspicion.
• Blood tests: serologic tests look for antibodies your immune system produces in response to Coccidioides. These are often the main diagnostic tools.
• Imaging tests: chest X-ray or CT scan can show pneumonia-like changes, nodules, or cavities in the lungs.
• Culture or molecular tests: in more complex cases, fungal cultures or PCR testing on sputum, tissue, or other fluids may be used to confirm the diagnosis.
• Spinal tap (lumbar puncture): if meningitis is suspected, cerebrospinal fluid can be tested for the fungus and antibodies.

It can take time for antibodies to show up in blood tests, so repeat testing may be needed.
For some people, diagnosis is made only after other conditions like bacterial pneumonia,
tuberculosis, or even cancer have been ruled out.

Valley fever treatments: from watchful waiting to antifungals

The treatment approach depends on how sick you are, whether you have risk factors for
severe disease, and whether the infection is confined to the lungs or has spread elsewhere.

When no antifungal medication is needed

Many otherwise healthy adults with mild to moderate Valley fever improve on their own
without antifungal medications. In these cases, treatment focuses on:

• Rest and pacing activities
• Drinking plenty of fluids
• Over-the-counter pain relievers and fever reducers as recommended by a healthcare professional
• Follow-up visits and periodic chest imaging or blood tests to monitor progress

Even without antifungal drugs, your healthcare team may monitor you for months to be sure
the infection is resolving and not quietly progressing.

Antifungal medications

Antifungal therapy is usually recommended if:

• You have severe symptoms or extensive pneumonia
• You have risk factors for complications (for example, immunosuppression, pregnancy, diabetes)
• The infection has lasted a long time or appears to be worsening
• The disease has spread outside the lungs

Common antifungal medications used for Valley fever include:

• Fluconazole – often the first-line oral treatment for many cases, including meningitis
• Itraconazole – another oral option, sometimes preferred for bone or joint disease
• Voriconazole, posaconazole, or isavuconazonium – newer antifungals used in certain complicated cases
• Amphotericin B – a powerful intravenous antifungal reserved for very severe disease, pregnancy in some situations, or when other drugs are not effective

Treatment duration can range from several months to a year or more, depending on the
severity and site of infection. For coccidioidal meningitis, long-term or even lifelong
therapy is often needed to prevent relapse.

Because antifungal medications can have side effects (including liver issues and drug
interactions), they should be monitored carefully by a healthcare professional, with
periodic blood tests.

Possible complications and long-term outlook

Most people with Valley fever recover fully and develop some level of immunity, which lowers
the chance of getting it again. However, complications can occur, especially in higher-risk
individuals.

Potential complications include:

• Chronic pneumonia or persistent lung nodules
• Thin-walled cavities in the lungs that may bleed or rupture
• Disseminated infection involving skin, bones, joints, and other organs
• Coccidioidal meningitis affecting the brain and spinal cord
• Long-lasting fatigue and reduced exercise tolerance

Even when the infection is controlled, some people continue to feel more tired or short of
breath than before, or they may have residual lung scars seen on future imaging. This can
be frustrating, but understanding that these after-effects are part of the condition – and
not “all in your head” – often helps people pace themselves and seek appropriate follow-up.

Prevention tips: can you avoid Valley fever?

There is currently no widely available vaccine for Valley fever. Prevention focuses on
reducing exposure to dust and soil in endemic regions, especially if you’re at higher risk.

Helpful strategies include:

• Limiting outdoor activities during dust storms or very windy days
• Closing windows and using air conditioning or air filtration when dust levels are high
• Wetting soil before digging or disturbing it to reduce dust
• Wearing a well-fitted mask or respirator for work that involves dust or soil in high-risk areas
• Keeping pets indoors during dust storms and avoiding unnecessary off-road activities on dry soil

For people with very high risk – such as those with severe immunosuppression – healthcare
professionals may recommend extra precautions or discussing the risks and benefits of living
or working in certain regions.

When to see a doctor or seek emergency care

Because Valley fever symptoms overlap with many other conditions, it’s better to err on the
side of caution if you don’t feel well after spending time in an endemic area.

Call a healthcare professional if:

• You live in or recently visited a Valley fever region and have flu-like symptoms lasting more than a week or two
• You have a persistent cough, chest pain, or shortness of breath that’s not improving
• You notice red, tender skin bumps plus joint pain and fever
• You’re pregnant, immunocompromised, or have chronic health conditions and feel unusually ill after dust exposure

Seek emergency care if you experience:

• Severe trouble breathing
• Chest pain that feels like pressure, squeezing, or is accompanied by sweating or nausea
• Severe headache, stiff neck, confusion, or difficulty staying awake
• Vision changes, seizures, or sudden weakness or numbness
• High fever that doesn’t respond to medication or rapidly worsening symptoms

Valley fever is serious, but getting diagnosed early and starting appropriate care makes a
big difference in how you feel and how quickly you recover.

Experiences with Valley fever: what it’s really like

Reading the list of symptoms and treatments is helpful, but it doesn’t fully capture what
Valley fever feels like for real people. Many describe it as “a flu that never ends,” mixed
with a frustrating sense that others don’t realize how sick they are because the illness
isn’t as famous as the flu or COVID-19.

One common theme in patient stories is the delayed diagnosis. Someone might spend weeks
bouncing between clinics with a “stubborn cough” or “walking pneumonia,” trying antibiotics
that do nothing. Only when a provider asks, “Have you traveled to Arizona or California
recently?” does the lightbulb go on and testing for Valley fever begins. That delay can be
emotionally exhausting, especially when people feel dismissed or told they’re just anxious.

Fatigue is another big part of the Valley fever experience. People talk about being able to
work long shifts or hike miles before getting sick, then find themselves winded walking from
the parking lot to the store. Friends may say, “But you look fine,” while the person with
Valley fever feels like they’re carrying around an invisible weight vest all day. For some,
this fatigue slowly improves. For others, it comes and goes in waves for months.

Treatment journeys can vary dramatically. One person might never need antifungal medication
and simply focus on rest, fluids, and patience. Another may start daily fluconazole and need
frequent lab tests to watch for side effects. People with severe disease sometimes describe
weeks in the hospital on intravenous antifungals, followed by months of pills. The process
can feel like a marathon, not a sprint, and having a knowledgeable infectious disease
specialist on the team often makes the path clearer.

Emotionally, Valley fever can be unsettling. It’s strange to realize that something as ordinary
as breathing dusty air on a hike or worksite exposed you to a fungus capable of reaching your
lungs, bones, or brain. Some people report feeling anxious about going outside on windy days
or returning to high-risk regions. Over time, education and support usually help ease these
fears. Learning that most people recover, that treatment exists, and that follow-up imaging
can track healing gives many patients back a sense of control.

Support systems matter. People who do best often mention a mix of good medical care, flexible
employers, and loved ones who believe them when they say, “I’m still tired; I need to rest.”
Simple adjustmentslike setting smaller daily goals, breaking chores into short blocks,
and accepting helpallow healing instead of pushing through and crashing. Online or local
support groups can also be valuable, offering a space where people can compare symptoms,
share tips about managing side effects, and celebrate small wins, like being able to walk
farther or return to hobbies.

If you’re dealing with Valley fever now, you are not aloneeven if it sometimes feels that
way. Asking questions, tracking your symptoms, and building a care team you trust can help
you move from fear and uncertainty toward a plan. You may have to slow down for a season,
but with time, many people do regain energy and return to their usual lives with a new
appreciation for their lungs, their immune system, and the simple joy of feeling well again.

Bottom line

Valley fever is a fungal lung infection that ranges from silent and mild to severe and
life-threatening. It’s caused by inhaling spores from Coccidioides fungi that live in
dry soils in parts of the Americas. Most people either never know they were infected or recover
with rest and monitoring. Othersespecially those with risk factorsmay need months or even
years of antifungal treatment and close follow-up.

If you live in or travel to high-risk areas and develop persistent flu-like symptoms,
especially after dust exposure, talk with a healthcare professional about Valley fever. Early
testing, appropriate treatment, and realistic expectations for recovery can make this condition
far less scary. You can’t control the dust in the desert, but you can control how quickly you
get answers and the support you have along the way.

Important note: This article is for general information only and is not a substitute for
professional medical advice, diagnosis, or treatment. Always speak with your healthcare
professional about your specific situation.

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