I put a heating pad on my lower back 4 months ago because of back pain due to a kidney infection. Now, about every other day, my lower back on my right side in a small area hurts when I touch it, and if feels like its a little swollen. It goes a way in five minutes. Could it be a blood clot?
With kidney infection it is common to have back pain. Here your back pain could be related to various things like muscular pain, due to kidney issue, or disturb spinal disc at that level.However the conformation will be done only by physical examination and different reports like ultrasound abdomen to see the kidney issues and x-ray or MRI of spine to see spinal issues. If your back pain is radiating to your legs along with numbness or tingling in legs then it can be related to lumbar disc or at that level nerve compression also. Otherwise, it will be a muscular pain or pain due to kidney infection.However the swelling over that area represent the inflammation at lumbar level where it's paining. Usually when ever there is swelling I suggest to use hot and cold pack in combination to reduce swelling as well reduce pain and I suggest same for you too. Further diagnosis and treatment can be planned only after physical examination and diagnosis, so I suggest visiting your specialist doctor as early as possible. If its due to kidney infection I suggest do not delay treatment. Take care.