aetiology, pathophysiology, etiopathogenesis, pathogenesis, aetiologies, etiologically, aetiologic, etiological, physiopathology, etiopathogenetic, more...

causelessness, effect, result, consequence, outcome

unknown, specific, common, infectious, possible, exact, genetic, organic, bacterial, uncertain, multifactorial

the cause of,   unknown cause,   a cause of,   drive diagnosis,   cause of a disease,   medical cause