Key Points:
UK mom Tia Doyle, 31, suffered near-fatal anaphylaxis
Initially mistaken for food poisoning
Diagnosed with rare MMAS disorder
Breast milk turned green after the reaction
Cause unclear, likely linked to immune response
A 31-year-old mother from Torquay, Devon, experienced a near-fatal allergic reaction that caused her to collapse unconscious and led to her breast milk turning an unusual green color, an incident that has raised medical curiosity.
The incident occurred in February 2022, when Tia Doyle, a mother of two, suddenly became unwell during the night.
She initially believed she was suffering from food poisoning, attributing her symptoms, including severe stomach pain, diarrhea, sweating, and exhaustion, to something she had eaten or the fatigue of caring for a newborn.
However, her condition deteriorated rapidly.
Doyle recalled developing a sudden feeling of dread as her throat began to close, making it difficult to breathe. Within minutes, she collapsed and lost consciousness as her body began to shut down.
Her partner found her unresponsive on the floor and rushed her to hospital. She later said this intervention likely saved her life.
Doctors confirmed that Doyle had suffered anaphylaxis, a severe and potentially life-threatening allergic reaction.
Further investigations led to a diagnosis of monoclonal mast cell activation syndrome (MMAS), a rare disorder in which mast cells release excessive chemicals and trigger unpredictable allergic responses.
The condition can cause symptoms such as:
Flushing
Severe abdominal cramps
Diarrhea
Wheezing
Fatigue
Sudden drops in blood pressure leading to fainting or collapse
Doyle had no prior history of allergies or intolerances, making the episode unexpected.
Doctors were unable to identify a definitive trigger for the reaction. Possible contributing factors included postpartum hormonal changes, physical exhaustion, and stress.
At the time, she was breastfeeding her three-month-old son, Leo.
After returning home from hospital, Doyle noticed a shocking change while expressing milk. Its color had shifted dramatically.
She described it as a “clear putrid green,” a stark departure from normal breast milk.
The unusual discoloration left her alarmed and confused.
Medical experts note that breast milk can change color during illness due to heightened immune activity, including increased levels of antibodies, immunoglobulins, and white blood cells that help fight infection.
However, the exact cause of such a vivid green color remains unclear, particularly in the context of a severe allergic reaction.
Monoclonal mast cell activation syndrome (MMAS) is a rare immune disorder in which abnormal mast cells release excessive chemical mediators, leading to repeated allergy-like reactions throughout the body. Unlike typical allergies, this condition stems from dysfunctional or clonal mast cells that overreact even without clear external triggers.
MMAS causes recurrent episodes of symptoms such as flushing, abdominal cramps, diarrhea, wheezing, and fatigue. In more severe cases, patients may experience hypotension (dangerously low blood pressure) that can result in dizziness or fainting. These symptoms often appear suddenly and can mimic severe allergic or anaphylaxis-like reactions.
Episodes are commonly triggered by factors such as certain foods, physical exertion, stress, environmental changes, or insect stings. The condition is often linked to a genetic mutation, most commonly in the KIT gene, which leads to abnormal mast cell activation and release of inflammatory substances.
MMAS closely resembles systemic mastocytosis but typically lacks hallmark skin lesions like urticaria pigmentosa, making it harder to diagnose. It is classified under primary mast cell activation disorders, where a clonal population of mast cells drives symptoms despite normal or near-normal mast cell counts.
Although Doyle has physically recovered, she now lives with a chronic and unpredictable condition.
The experience has had a lasting psychological impact, as she remains at risk of future reactions without warning.
She keeps a panic alarm at home, especially when caring for her children alone.
Reflecting on the incident, she described it as terrifying and said her “body was starting to shut down” during the reaction.
References:
1. Genetic and Rare Diseases Information Center (GARD). “Monoclonal Mast Cell Activation Syndrome.” U.S. National Institutes of Health. Accessed March 19, 2026. https://rarediseases.info.nih.gov/diseases/12980/monoclonal-mast-cell-activation-syndrome.
2. National Center for Biotechnology Information (NCBI). “Monoclonal Mast Cell Activation Syndrome.” MedGen, U.S. National Library of Medicine. Accessed March 19, 2026. https://www.ncbi.nlm.nih.gov/medgen/1672509.
(Rh/ARC)