If this is
kidney related, Symptoms that are more suggestive of a
kidney or urinary problem include pain in the side, swelling of the lower extremities, and problems with urination. With your history of lifting things, the pain is more likely due to musculokeletal causes. Warm compresses or pain medications may help. If it persists, evaluation by your doctor may be warranted. Diagnostics such as x-ray of the affected area or ultrasound may need to be done to visualize the structures.