Why would a person have frequent urination if he is not a diabetic / sugar patient?

Many reasons: There are many reasons for frequent urination beside diabetes. You could have a drug side effect, infection, prostate problems, kidney problems, hormone issues (there are lots of them: diabetes insipidus, hyperthyroidism, hyperparathyroidism, pheochromocytoma, cushing's syndrome, addison's...)....If it's excessive to you and is not getting better, see your doctor.