to become ill

to spoil  - estropearse, echarse a perder, saquear, estropear, arruinar, consentir, mimar 

to upset  - volcar, derramar, perturbar, disgustar, inquietar, alterar, molestar, sentar mal a, trastornar, desbaratar (planes, etc.), derrotar (en deportes) 

to make ill