Technical Abstract: When the starches were solubilized in most commonly used solvents (i.e., NaOH solution or Dimethylsulfoxide (DMSO)/H2O mixture), it is found that the solubilization procedure seriously affects the final state of the solutions. When the solution of the starches was stirred, the incompletely solubilized patches formed during the solubilization causes shear-induced aggregation yielding high viscosity and shows shear- thickening behavior (state I). On the other hand, when the solution was prepared by shaking, a clear solution with low viscosity was obtained (state II). Although both of these states are stable, only the transition from state I to II was allowed by shaking while the inverse transition was not induced by stirring. Only the state I solution showed shear-induced pattern, but the formed patterns disappeared after shaking the solutioon. These observations were explained by shear-induced aggregation of starches in solution. Optical micrographs and SEM images of these solutions suppor our interpretation.