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Rachel V Thomas

Bryan Johnson's Autoimmune Gastritis: US Doctor Explains the Hidden Signs of Autoimmune Disease

Billionaire entrepreneur <span>Bryan Johnson</span>, known for meticulously tracking his health and pursuing longevity, recently revealed that he has been diagnosed with <span>Autoimmune Gastritis</span>, an incurable autoimmune condition in which the body's <span>immune system</span> attacks the <span>stomach lining</span>.

Describing the disease on social media platform X, Johnson said: "My stomach is eating itself." He also noted that despite undergoing extensive medical evaluations over the years, the condition went undetected because autoimmune diseases often develop quietly, with symptoms that can easily be mistaken for everyday health issues such as fatigue or digestive discomfort.

According to the Centers for Disease Control and Prevention (CDC), autoimmune diseases occur when the immune system mistakenly attacks the body's own healthy cells and tissues, triggering inflammation and damage to organs or other body systems.

The burden of these conditions is significant. In May 2025, researchers from the Mayo Clinic and collaborating institutions estimated that nearly 15 million Americans are living with one or more of 105 recognized autoimmune diseases.

Because autoimmune diseases often begin with vague, non-specific symptoms, they can remain undiagnosed for months—or even years.

Dr. Cory Rice, a US-based Functional Medicine physician, said these warning signs frequently go unnoticed until the disease has progressed.

"First and foremost, symptoms of <span>autoimmune disease</span> can come and go, and be on and off, or they can be more persistent in nature," he told <em>Newsweek</em>.

<h2>The Hidden Signs You Shouldn't Ignore</h2>

While symptoms vary depending on the various autoimmune conditions, several early warning signs are shared across many autoimmune diseases.

According to Dr. Rice, common symptoms include:

<ul><li>Fatigue</li><li>Low-grade fever</li><li>Joint pain</li><li>Unexplained rashes or hives</li><li>Dry eyes and dry mouth</li><li>Numbness or tingling in the hands or feet</li><li>Mouth ulcers</li><li>Increased sensitivity to cold temperatures</li></ul>

He said when people suffer from fatigue, "it is usually both profound and debilitating."

Dr. Rice explained that many people try to manage this overwhelming exhaustion by relying on caffeine and other stimulants, taking thyroid medications or hormone treatments, or opting for therapies such as intravenous infusions and vitamin B12 injections. 

However, when an underlying autoimmune disease is responsible, these approaches often fail to provide lasting relief.

<h2>Why Autoimmune Diseases Are Often Diagnosed Late</h2>

One of the biggest challenges in diagnosing autoimmune diseases is that their symptoms overlap with those of many other medical conditions.

Johnson also said that "2-5 per cent of people have this (autoimmune disease). Likely more, because it hides".

Symptoms may also appear intermittently before becoming more persistent.

"It all depends on the disease process in play and the severity or progression of the disease itself in a particular person as to whether symptoms are more constant or intermittent," Rice said.

He added that many primary care physicians are not routinely trained to identify autoimmune diseases in their early stages. As a result, patients are frequently referred to specialists, including rheumatologists, only after symptoms have become more pronounced.

"Unfortunately, by this point, the autoimmune disease may already be far along in whichever parts of the body are impacted," he said.

Dr. Rice emphasized that recognizing symptoms early and obtaining a timely diagnosis can help slow disease progression and improve long-term outcomes.

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Autoimmune Gastritis

Autoimmune Disease

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bryan johnson diagnosed with autoimmune disease

bryan johnson diagnosed with autoimmune gastritis

stomach lining

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Billionaire entrepreneur Bryan Johnson, known for meticulously tracking his health and pursuing longevity, recently revealed that he has been diagnosed with Autoimmune Gastritis, an incurable autoimmune condition in which the body's immune system attacks the stomach lining.Describing the disease on social media platform X, Johnson said: "My stomach is eating itself." He also noted that despite undergoing extensive medical evaluations over the years, the condition went undetected because autoimmune diseases often develop quietly, with symptoms that can easily be mistaken for everyday health issues such as fatigue or digestive discomfort.According to the Centers for Disease Control and Prevention (CDC), autoimmune diseases occur when the immune system mistakenly attacks the body's own healthy cells and tissues, triggering inflammation and damage to organs or other body systems.The burden of these conditions is significant. In May 2025, researchers from the Mayo Clinic and collaborating institutions estimated that nearly 15 million Americans are living with one or more of 105 recognized autoimmune diseases.Symptoms Can Be Easy to MissBecause autoimmune diseases often begin with vague, non-specific symptoms, they can remain undiagnosed for months—or even years.Dr. Cory Rice, a US-based Functional Medicine physician, said these warning signs frequently go unnoticed until the disease has progressed."First and foremost, symptoms of autoimmune disease can come and go, and be on and off, or they can be more persistent in nature," he told Newsweek.The Hidden Signs You Shouldn't IgnoreWhile symptoms vary depending on the various autoimmune conditions, several early warning signs are shared across many autoimmune diseases.According to Dr. Rice, common symptoms include:FatigueLow-grade feverJoint painUnexplained rashes or hivesDry eyes and dry mouthNumbness or tingling in the hands or feetMouth ulcersIncreased sensitivity to cold temperaturesHe said when people suffer from fatigue, "it is usually both profound and debilitating."Dr. Rice explained that many people try to manage this overwhelming exhaustion by relying on caffeine and other stimulants, taking thyroid medications or hormone treatments, or opting for therapies such as intravenous infusions and vitamin B12 injections. However, when an underlying autoimmune disease is responsible, these approaches often fail to provide lasting relief.Why Autoimmune Diseases Are Often Diagnosed LateOne of the biggest challenges in diagnosing autoimmune diseases is that their symptoms overlap with those of many other medical conditions. Johnson also said that "2-5 per cent of people have this (autoimmune disease). Likely more, because it hides".Symptoms may also appear intermittently before becoming more persistent."It all depends on the disease process in play and the severity or progression of the disease itself in a particular person as to whether symptoms are more constant or intermittent," Rice said.He added that many primary care physicians are not routinely trained to identify autoimmune diseases in their early stages. As a result, patients are frequently referred to specialists, including rheumatologists, only after symptoms have become more pronounced."Unfortunately, by this point, the autoimmune disease may already be far along in whichever parts of the body are impacted," he said.Dr. Rice emphasized that recognizing symptoms early and obtaining a timely diagnosis can help slow disease progression and improve long-term outcomes.

bryan johnson's autoimmune gastritis: us doctor explains the hidden signs of autoimmune disease

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