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).