Hi, Thanks for writing in. Please find my observations below. 1. The kidneys are well protected organs in the abdomen. It is first protected by a strong capsule and then surrounded with fat. Then there is bowel in front of it and from all sides there is the muscle in abdominal wall protecting the kidney from trauma. 2. From the above, it is less likely that the pain is from any kidney internal bleeding if you have no other urinary symptoms of trauma to kidneys like passage of dark urine. 3. Since if is on the left side of the body, thought must also be given to the spleen and if the pain is severe then you immediately require an ultrasound examination to make sure you do not have any splenic injury resulting from the trauma incident. 4. Please take rest for about an hour and if it is still paining severely then visit the ER and get yourself evaluated for any internal injury probably involving spleen.