My mother she is 65yrs old while she walking early morning no swelling but after some time swelling appear i done serum uric acid its 2.6 and xray foot also its also normal i taken her to MS doctor he said its urine infection morning i have to urine routine and its also normal what's the fault she diabetic and hypertension and sugar also in control while we putting in hot water swelling is reducing after some it same swelling appear is this any serious issue she had recently angiography also its normal and is this any ligament issue or any tendon rupture