The symptoms of diabetes may begin gradually and can be hard to identify at first. They may include fatigue, a sick feeling, frequent urination, especially at night, and excessive thirst. When there is extra glucose in blood, one way the body gets rid of it is through frequent urination. This loss of fluids causes extreme thirst. Other symptoms may include sudden weight loss, blurred vision, and slow healing of skin, gum and urinary tract infections. Women may notice genital itching.