Diabetes mellitus has multiple symptoms including:
Increased thirst (polydipsia), increased frequency of urination ( polyuria), excessive hunger (polyphagia), feeling tired / fatigue and weight loss.
This medpedia article explains Diabetes mellitus, Type 2:
http://wiki.medpedia.com/Type_2_Diabetes_Mellitus
Now there are many causes for increased frequency of urination. They are:
Simply an increased consumption of water, drinking tea or coffee, using diuretics, an enlarged prostate, over-active bladder, urinary tract infection or pelvic mass, anxiety or a neurological condition.