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It might be a kidney problem. See a doctor. It is serious even if it is not a kidney problem.
Back pain lower right side causes are: Lower back and kidney disorders.
No, swelling of the low back is not normal, although muscle spasms and low back pain are a common side effect of pregnancy.
It is likely NOT a true "swelling" (such as the swelling around a sprained ankle). Instead, you probably have an area of muscle spasms. Muscles can feel "swollen" and hard when a person has a back injury. Let your doctor examine the area and ask if there is an anti-inflammatory or muscle relaxer that might help you.
ringworm?
Blockage of and lymph vessel is keeping the fluids (usually blood, blood that is in need of cleaning) from entering the lymph node. This blockage causes additional blood that needs to be delivered to the lymph node for filtering to back up, kind of waiting for it's turn. This back-up of blood, (and sometimes other fluids), is what causes the swelling.
the cat is swelling because it ate large amounts of yeast and cement
what is mucor?
lumbar area
Lumbar
lumbar
You could have a slipt disc in your lower back, they are very painful.