Shumaca waa in lagu kaydiyaa meel qabow, mugdi iyo qalalan.Heerkulka xad-dhaafka ah ama iftiinka qorraxda tooska ah ayaa sababi doona in dusha sare ee shumaca dhalaali doono, taas oo saamayn doonta heerka udgoonka shumaca, taas oo keenaysa in uu sii daayo udgoon ku filan marka la shido.