Rare Mast Cell Disorder Misdiagnosed as Allergies for Years in Utah Woman

SALT LAKE CITY — For years, Misty Segrest believed she was suffering from severe allergies. Symptoms began with unexplained red spots and swelling, causing significant discomfort. “It first started with these little red spots just showing up everywhere. It would feel like little ants — they would swell up like little hives all over my body and it was horrible,” she said. Despite seeking medical attention repeatedly, she received no definitive diagnosis.

After more than a decade of searching for answers, Segrest was referred to Dr. Tsewang Tashi, a hematologist at the Huntsman Cancer Institute. Dr. Tashi identified the root cause of Segrest’s symptoms: a rare condition called systemic mastocytosis, affecting an estimated 1 in 10,000 to 20,000 people .

Understanding Systemic Mastocytosis

“It’s a disease of the mast cells,” explained Dr. Tashi. Mast cells are crucial components of the immune system, but an overabundance of these cells can trigger widespread reactions throughout the body. This can manifest in symptoms that closely resemble allergic reactions, often leading to misdiagnosis and delayed treatment.

Symptoms of systemic mastocytosis can include intense itching, flushing of the skin, the development of hives, abdominal pain, diarrhea, and persistent fatigue. In more severe cases, the condition can even lead to anaphylaxis, a life-threatening allergic reaction.

Hope for Improved Treatments

Dr. Tashi noted that targeted therapies for systemic mastocytosis have advanced in recent years, with several promising new treatments currently under development . These advancements offer hope for more effective treatment options in the future.

A Path to Relief and Encouragement

With an accurate diagnosis, Segrest was finally able to receive the appropriate treatment. She now takes Ayvakit, a medication that has significantly alleviated her symptoms. “There were a lot of tests and scans and things I had to go through to get to this point,” she said. “It was an absolute relief to know what I actually had all this time.”

Segrest hopes that by sharing her story, she can encourage others experiencing unexplained symptoms to persevere in their search for answers. “You can’t give up, you got to keep trying,” she emphasized. “I don’t feel self-conscious since of how pronounced those red spots were. The quality of life is so much better for me.”