Bruised spleen symptoms are not very clear, resulting in late diagnosis of the condition. Noticeable ones include abdominal pain, soreness in the abdomen, localized back pain, and low blood pressure amongst others. Advertisement. The spleen is a crucial organ of the immune system, responsible for preventing infections.It is located on the upper left side of the body, below the diaphragm (in the 9-12 ribs). Its susceptibility to injury is partly because of its position in the abdomen.amage or injury to this organ is a cause of medical concern, considering its role in the proper functioning of the body.. The prime reason for a bruised spleen is physical injury or a direct blow to the area. Also, it is prone to damage when it is in the enlarged state, particularly during the episode of an infection.