This research presents results of a theoretical analysis on bored piles under different loading conditions and soil types to estimate the necessity of reinforcement. A three-dimensional finite element model is used to analyze a bored pile under simultaneously axial and lateral loading, different cases of pile length and soil types. In modeling the bored pile and the surrounding soil, the finite element model was modified for each case analyzed to account for the particular details. The Mohr -Coulomb option was considered to model the sandy soil plasticity, and the bilinear kinematic hardening option was deemed to model clayey soil plasticity. The accuracy of the computer program checked by comparing its results with those obtained from full-scale instrumented pile loading tests. The results indicated that the lateral load is the major factor that affects the amount and the distribution of the stresses along the pile shaft, it also affects the position of the maximum stress occurred along the pile shaft. The axial load seems to have a little effect on the distribution of the stresses, but the high value of this load causes to generate a compression stress on the cross section of the pile in spite of the existence of the lateral loads. The pile length and the soil density of sand and the consistency of clay affect the distribution of the stresses along the pile shaft and the position of the maximum stress. Bored piles in swelling soils are also analyzed, the results show that the movement of these soils induces tensile stresses in the pile shaft, the amount of these stresses depends on the value of soil movement, pile length, the undrained shear strength of the soil and on the applied axial load. The effect of the dissipation of the heat of hydration during concrete curing considered. The tensile stresses generated due to this effect lead to produce cracks inside and on the surface of the shaft. According to the results presented from the finite element approach. The bored pile must be reinforced, and this reinforcement is needed to carry both the tensile and compressive stresses generated in the pile shaft due to applying axial and lateral loads. This is applicable for both types of soil used i.e. sandy and clayey soils. Short piles (L ≤ 10 m) should be fully reinforced when it is embedded in sand or clay soil. For long piles with length more than 20 m, the extension of reinforcement can be reduced by a ratio of 25% to 50% depending on the pile length, soil type, and the magnitude of the axial and lateral loads. Additional reinforcement should be provided to take over the effect of heat of hydration.