There are many signs and symptoms that can indicate diabetes.

Signs and symptoms can include the following:

• Unusual thirst
• Frequent urination
• Weight change (gain or loss)
• Extreme fatigue or lack of energy
• Blurred vision
• Frequent or recurring infections
• Cuts and bruises that are slow to heal
• Tingling or numbness in the hands or feet
• Trouble getting or maintaining an erection

Source: http://www.diabetes.ca/about-diabetes/signs-and-symptoms