Iyadoo kaabayaasha miyiga ay sii kordhayaan, baahida loo qabo nalalka waddooyinka ayaa si weyn u kordhay. Si kastaba ha ahaatee, nalalka waddooyinka ee dhaqameed badanaa waxay la kulmaan caqabado meelaha miyiga ah, sida rakibidda adag, dayactirka adag, iyo korontada aan la isku halleyn karin. Xaaladdan oo kale, nalalka waddooyinka ee isku dhafan ayaa soo baxay iyagoo ah xal ku habboon nalalka waddooyinka miyiga ah sababtoo ah faa'iidooyinkooda gaarka ah.