Hello,
Without examination confirmation of a diagnosis is tough but
frequent urination (polyuria) can be due to diabetes mellitus. Other possibilities are diabetes insipidus, glomerulonephritis, pyelonephritis(inflammation of the kidneys),urinary tract infection, hypercalcemia, hypokalemia(low potassium),hyperthyroidism, hyperparathyroidism, diuretic drugs and benign hyperplasia of the prostate(in males).