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A woman’s lifelong health issues and a unique birthmark led to a shocking discovery: she is her own twin

For years, doctors couldn't explain her mysterious autoimmune problems. The answer was hidden in her DNA, a rare condition that made her two people in one.

chimerism, rare disease, medical mystery, good news, health, autoimmune disease, human body, genetics, twins, birthmark, inspirational story

A doctor chats with a patient

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For most of her life, singer-songwriter Taylor Muhl lived with two mysteries: a unique birthmark that split her torso into two different skin tones, and a host of chronic health issues that no doctor could explain. While doctors dismissed the distinct line down her abdomen as a simple birthmark, Muhl’s health told a different story.

“I probably did not get any health challenges until my preteens and my teenage years,” Muhl shared in an interview with TODAY. “I would go to doctors a lot. I would get the flu all the time or sinus infections or chronic sinus infections or migraine headaches. They couldn’t find anything.”


Despite undergoing CAT scans, MRIs, and countless specialist visits, the root cause of her autoimmune-like symptoms remained elusive. The questions started when she was a young dancer.

chimerism, rare disease, medical mystery, good news, health, autoimmune disease, human body, genetics, twins, birthmark, inspirational story A group of young dancers line upCanva

“I first really noticed, ‘Wait a minute, why doesn’t my stomach look like the other girls’ stomachs?’” she recalled. When she asked her mother, the answer was always the same: “It’s just a birthmark, and you’re special.”

The answer didn't come from a medical journal, but from her living room couch. One evening, she was watching a documentary that featured an image of a person with the same two-toned torso. “It looked identical to my stomach,” she said. “It was the first time ever in my entire life that I saw anybody who had a stomach like mine.”

chimerism, rare disease, medical mystery, good news, health, autoimmune disease, human body, genetics, twins, birthmark, inspirational story A woman with a skin condition looks at her armCanva

A week later, she mentioned it to a doctor. “And I go, 'Well, I do have a birthmark on my torso and I saw this show.'"

After further testing, the truth was revealed: Muhl has a rare genetic condition called chimerism. She has two sets of DNA, two bloodstreams, and two immune systems. She had absorbed her fraternal twin in the womb. In her own words:

“I am my own twin.”

The diagnosis finally explained her lifelong health struggles. Her body was constantly fighting her twin’s cells as a foreign invader. “My body is treating my sibling’s makeup as foreign matter and it wants to reject it. And it can’t,” she explained. “My immune system is much lower than the average person’s... almost as low as somebody who has cancer.”

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From Diagnosis to Advocacy

Since her diagnosis went public, Muhl has embraced her unique condition, becoming a powerful advocate for chimerism awareness, autoimmune diseases, and body positivity. She now uses her platform to share her journey, offering support and visibility to others living with rare conditions and promoting a message of self-acceptance.

While the diagnosis was shocking, it brought an immense sense of relief, finally explaining a lifetime of questions. “I felt freedom [after the diagnosis] because for the first time in my life, I knew why my stomach looks the way it does,” Muhl told People, per Live Science. “Finally, this is making some sense.”

This article originally appeared earlier this year.