IT WAS OVERUSE of acetaminophen that finally led to Nic Petermann’s cancer diagnosis. For months, the then 26-year-old had been contending with exhaustion, night sweats, recurring fevers, and abdominal pain so debilitating that she regularly woke up in the middle of the night to take soothing baths. Her persistent flu-like symptoms, she’d read online, were probably just the lingering effects of a Covid infection she’d had in January 2021; the pain was the odd symptom out, but an ultrasound had turned up nothing.