Emergency medicine physician Dr. Stephanie Widmer discusses NASCAR icon Kyle Busch’s death and highlights warning signs of severe pneumonia on ‘Fox & Friends.’

The sudden death of NASCAR icon Kyle Busch from pneumonia complicated by sepsis is a heartbreaking tragedy that has stunned the sports world and the nation. Known for his fierce competitiveness and athletic endurance, Kyle represented strength and passion. His passing is a sobering reminder that infections can become deadly, even in young healthy, high-performing individuals.

Professional race car drivers are exposed to some unique medical and physiological health risks because of extreme gravity forces, heat, speed, vibration, fumes. This can cause respiratory irritation, heat illness, dehydration, electrolyte abnormalities, and, also, cardiac strain as adrenaline surges during a race leading to increased blood pressure and heart rate. Racers can sweat more than a gallon during a race. It’s an intense sport. Cardiovascular strength and endurance, head, neck and core strength are vital to thrive in racing. 

So, when infection hits, it can be dangerous without proper early intervention.

Pneumonia remains one of the most common infectious illnesses in the United States and is a leading cause of sepsis, a life-threatening medical emergency that occurs when the body’s response to infection spirals out of control and begins damaging its own organs and tissues. It impacts more than 300,000 Americans each year.

HOW PNEUMONIA PROGRESSES TO SEPSIS: DOCTORS EXPLAIN AFTER KYLE BUSCH'S DEATH

A NASCAR fan displays a No. 8 flag during a remembrance ceremony for Kyle Busch before the NASCAR Cup Series Coca-Cola 600 at Charlotte Motor Speedway in Concord, N.C., on May 24, 2026. (Jonathan Bachman/Getty Images)

Sepsis can progress rapidly, sometimes within hours, leading to organ failure, shock and death if not recognized and treated early. Pneumonia, urinary tract infections, abdominal infections and skin wounds are some common types of infections that could lead to sepsis without appropriate early intervention and treatment. Death from pneumonia and sepsis usually happens in those over the age of 65.

In Kyle’s case, he had an aggressive infection that spread from his lungs into his bloodstream. President Bill Clinton was hospitalized for urosepsis stemming from a urinary tract infection. He was immediately given IV fluids and IV antibiotics, preventing his condition from turning into septic shock.

Boxing Legend Muhammad Ali was reported to have died from septic shock after being hospitalized with a respiratory illness. Actress Sharon Stone nearly passed from sepsis due to an abscess infection in tissue that had spread.

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Many Americans mistakenly believe sepsis only affects the elderly or critically ill. While older adults and people with chronic medical conditions are certainly at higher risk, sepsis can also affect younger, active people if they pick up an aggressive infection that spreads with delayed treatment and insufficient time for healing, rest and recovery.

Bacterial pneumonia, influenza, rsv, skin infections and urinary tract infections are common illnesses that can sometimes lead to sepsis but this is usually seen in those over age 65 or under 1.

Infections that begin as "just a cold," a sinus infection, or a respiratory illness can sometimes worsen unexpectedly and fast. Whether I'm working in the ER or clinic, these are the warning signs I tell my patients should never be ignored.

KYLE BUSCH 911 CALL REVEALS DRIVER WAS COUGHING UP BLOOD, STRUGGLING TO BREATHE ON BATHROOM FLOOR

NASCAR Hall of Famer Richard Childress, Samantha Busch, Brexton Busch and NASCAR CEO Steve O’Donnell stand on the grid during a remembrance ceremony for Kyle Busch before the Coca-Cola 600 at Charlotte Motor Speedway in Concord, N.C., on May 24, 2026. (Jonathan Bachman/Getty Images)

One of the dangers of sepsis is how quickly it can escalate. The body’s immune system becomes chaotic and uncontrolled, triggering widespread inflammation, blood vessel damage, clotting abnormalities and impaired oxygen delivery to vital organs.

In severe cases, patients can develop septic shock, respiratory failure, kidney injury or acute respiratory distress syndrome in a matter of hours. The blood pressure drops, heart rate can shoot up, fever may be present. It's serious and should never be "slept off."

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This is why it’s important to listen to your body and do not delay seeking medical care.

Competitive talented athletes like Kyle Busch may sometimes push through illness, fatigue, dehydration, physical stress, travel demands and intense training schedules. While exercise and fitness are generally protective for overall health, no one is invincible to aggressive infections. Athletes may also dismiss early symptoms or delay seeking care because they are accustomed to performing through discomfort.

The good news is there are important steps people can take to lower their risk:

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Do not ignore difficulty breathing, worsening cough, chest pain, confusion or coughing up blood.

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Sepsis is one of the leading causes of death worldwide, yet public awareness remains low. Early recognition and fast treatment with antibiotics, oxygen, fluids and supportive care can save lives.

As we all mourn the loss of Kyle Busch, we can use this moment to educate the public about the seriousness of pneumonia and sepsis. His death is not only a tragedy for racing fans, but a reminder to every American that infections can happen to anyone and that recognizing the warning signs early can save a life.

Dr. Janette Nesheiwat is a double board certified physician at Walter Reed National Military Medical Center caring for members of the U.S. military and veterans. Nesheiwat is a former Fox News contributor who was previously nominated for U.S. surgeon general. These views are her own and do not reflect those of her employer. Find Nesheiwat on Twitter @doctorjanette, Facebook @drjnesh and Instagram DrJanette.

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