Acute unilateral foot drop is a well-known entity, but bilateral foot drop in progressive fashion is rare. In particular, slow-progressing bilateral foot drop occurs with various metabolic causes, as in anorexia nervosa, hypothyroid myopathy, Crohn 's disease, and post-electroconvulsive therapy. Parasagittal intracranial and spinal pathologies and cauda equine may also cause progressive bilateral foot drop. This case is presented with bilateral foot drop due to common peroneal nerve entrapment.