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Since you are a diabetic, you are increasingly prone for infections than others. Regarding bladder infections, it can result from infections, and decreased fluid intake. Eat plenty of fresh fruits and vegetables. Drink a glass of cranberry juice which helps to reduce the symptoms of urinary tract infection
Radiation is known to cause inflammation of the bladder called Radiation cystitis
and possible stricture of the urethra
which can also cause urinary bladder inflammation
and haemorrhage. You need to confirm these by your Urologist
. You can take Pentoxiylline tablets to relieve you of the pain after approval from your Doctor only. Also drink green tea as it has antioxidants which reduce the damage in the bladder.