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A new study found that more than 1 in 10 US adults with preexisting conditions saw those conditions worsen after a COVID-19 infection. Respiratory issues, fatigue, and mental health problems topped the list. Researchers say this often-overlooked dimension of Long COVID deserves far more attention.
When we talk about Long COVID, the conversation usually centers on brand-new symptoms appearing after infection — but a new preprint study highlights a different, underexplored angle: COVID can also make existing health problems significantly worse.
Researchers analyzed data from 2,227 US adults who completed health questionnaires at 3, 6, and 12 months post-COVID infection. About 94% had at least one underlying condition before getting sick, and 11.8% reported that COVID worsened at least one of those preexisting conditions. Participants also flagged real-world struggles — managing symptoms, keeping up with daily activities, and navigating the healthcare system.
The study, led by Eagle Global Scientific and not yet peer-reviewed, found that worsening conditions spanned multiple body systems, from lungs to mental health.
By the Numbers:
Why it matters: As SARS-CoV-2 continues to circulate and reinfect people, understanding how COVID amplifies existing conditions — not just creates new ones — is critical for guiding patient follow-up, care planning, and Long COVID research priorities.
