undiagnosed
adj. B2 Upper Intermediate US //ənˈdaɪæɡnoʊst// UK //ʌndˌaɪəɡnˈəʊzd// un·di·ag·nosed
adj. describing a medical condition that has not been identified or recognized by a doctor yet.
adj. relating to a medical condition or symptom that has not yet been identified or confirmed by a professional diagnosis.
He lived with undiagnosed diabetes for several years.
The patient's symptoms were initially dismissed as stress, but they were later found to be signs of an undiagnosed heart condition.
Many chronic illnesses remain undiagnosed for decades because their symptoms are subtle or mimic more common, less severe health issues.