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The main reason for elevations of glucose in the urine is, not surprisingly, diabetes mellitus. This disease causes such overwhelming hyperglycemia that the kidney's capacity to reabsorb the filtered glucose (a maximum of about 180 mg/dL) is breached, leading to glucose excretion in the urine.
Not in most cases. Glucose will usually only show up in the urine if it is at sufficiently high levels in the blood so that the body is dumping the excess into the urine, or if there is some degree of kidney damage and the glucose is leaking out into the urine.