Black mold’s potential link to fatal DC shooting: What to know

Matt Lambert, who on Thursday allegedly shot five people in his Washington condominium complex, cited black mold exposure as a justification for the violent attack.Lambert, an emergency medicine physician turned healthcare IT executive, was engaged in a legal battle with the Metropole Condominium Association and the building’s property manager over severe black mold damage and a rodent infestation, among other problems, that had made his dwelling untenable, according to authorities and reports.While Lambert had not lived full-time in the apartment since November 2024 and there is no direct evidence causally linking mold exposure to the attack, health experts say black mold can be highly toxic and have negative consequences for a person’s health. Black mold exposure can cause a range of upper respiratory symptoms, from sneezing to difficulty breathing, and potentially severe infections in the worst cases.Although public health institutions widely do not recognize black mold as a direct cause of psychotic episodes or other severe mental health problems, Make America Healthy Again activists and other natural wellness advocates say black mold exposure can cause even more serious mental health consequences, including psychosis.Alex Clark Voetberg, host of Turning Point USA’s wellness podcast Culture Apothecary, said on X following the shooting that “subjecting yourself to living in black mold for prolonged periods of time can lead to severe psychosis and mental health issues.” If you listen to my show you know that subjecting yourself to living in black mold for prolonged periods of time can lead to severe psychosis and mental health issues. Marriages that are on the brink of divorce have been saved by moving from mold ridden homes. Kids with severe… https://t.co/S7ilsanb9q— Alexandra Voetberg (@Realalexclark) November 12, 2026 “Marriages that are on the brink of divorce have been saved by moving from mold ridden homes,” Voetberg wrote. “Kids with severe behavior issues have been ‘fixed’ by moving from mold. It is so deadly serious to get out of these environments immediately while you fight with your apartment or HOA.”Here’s what to know about black mold and possible side effects from exposure.What are common health problems from black mold exposure? Respiratory symptoms are the most common outcomes associated with black mold exposure, according to the Centers for Disease Control and Prevention.According to the Cleveland Clinic, symptoms of black mold exposure include itchy eyes or throat, nasal congestion, coughing, sneezing, wheezing, and chest tightness or difficulty breathing. Over-the-counter medications to remedy these respiratory symptoms include decongestants, antihistamine medications such as Benadryl, and nasal irrigation systems such as a neti pot.People with asthma are significantly more likely to have severe allergic reactions, and those with chronic lung disease or compromised immune systems are more likely to develop serious infections due to mold exposure.The Cleveland Clinic recognizes that prolonged exposure in certain severe cases can cause chronic fatigue, brain fog, headaches, and widespread body or joint pain.Are there possible mental health effects? Although the science is far from settled on the matter, an emerging body of research suggests prolonged mold exposure can cause mental health consequences, such as cognitive impairment, anxiety, and depression.A 2021 paper by researchers at the City University of New York that was published in the journal Brain, Behavior, and Immunity found that mold exposure triggers an immune system response, which in turn can produce “cognitive and emotional dysfunction.”The authors speculate that prolonged mold spore exposure can have lasting effects on a person’s autoimmune system and lead to chronic inflammation.“Mold exposure, both toxic and nontoxic, must be considered another factor, like pesticide exposure or smoking, that can add to an individual’s burden of inflammation with possible serious consequences for health and behavior,” the authors wrote.Researchers at the Neuroscience Institute in Miami refer to the negative health consequences of mold as “Toxic Mold Syndrome” and say it is caused by neuro-inflammation from exposure to mycotoxins released by black mold species.According to the institute, the stress of living in an environment contaminated with mold “can exacerbate underlying mental health conditions or even precipitate new ones,” such as constant worry about health and generalized fatigue feeding into anxiety and depression symptoms.Did Lambert report health problems from the mold? Lambert, in a series of interviews in November and December 2025, said the ordeal had taken an excessive toll on his mental and physical wellbeing.In an interview with Michael Brice-Saddler, who at the time worked for the Washington Post, Lambert said his overall resilience had taken a hit due to the ongoing legal dispute.“It’s affected every part of my life – my sleep, dietary habits,” Lambert told Brice-Saddler, who now writes for the Washington Sun. The outlet published a profile of Lambert on Thursday after the shooting, using interviews conducted last fall.The profile outlined several disturbing, paranoid vignettes between the interviewer and Lambert, including references to assassin Luigi Mangione, who confessed to killing UnitedHealthcare CEO Brian Thompson in 2024.Lambert also reportedly said the legal dispute had made him “radioactive” and described his messaging in the campaign against the HOA as “increasingly aggressive.”