The classic symptoms of diabetes include:

  • Excessive urination
  • Increase in thirstA
  • Increase in appetite
  • Weight loss
  • Loss of vision
  • Fatigue
  • Slow healing
  • Impotence in men

In the case of type 1 diabetes, these symptoms may develop very quickly. In the case of type 2 diabetes, there may be a lack of symptoms or their development may be slow.

Type 1 diabetes may produce rapid weight loss, despite normal or increased eating. Loss of weight may not be a typical symptom for type 2 diabetes.

Increased urination results in the replacement of blood volume by the water from the body’s cells. This leads to dehydration as well as an increase in thirst.

Glucose adsorption results from persistently high levels of glucose in the blood. This produces a change of shape in the lenses of the eye. These shape changes result in vision change and blurred vision. Type 1 patients may undergo rapid vision changes, whereas in type 2 patients, the changes may be gradual.
Some patients (usually type 1) may show symptoms of diabetic ketoacidosis. These include:

  • Smell of acetone on the patient’s breath
  • Deep breathing
  • Nausea
  • Vomiting
  • Abdominal pain
  • Altered states of consciousness

Severe cases may result in coma, which may end up in death. It is an emergency situation and requires hospitalization.