Your symptoms depend on which complication of type 2 diabetes you have.

Eye disease

Diabetic retinopathy in its early stages does not noticeably affect your vision. But if it's not treated early, diabetic retinopathy can cause symptoms such as:

• Blurred or distorted vision or difficulty reading. This may be caused by macular edema or other changes in the retina. High blood sugar levels may cause temporary blurred vision, which will clear up after the level returns to a normal or near-normal range. It may take several hours after blood sugar has been corrected for your vision to return to normal. Contact your health professional if vision changes last 12 to 24 hours.
• Floaters or flashes of light in your field of vision. These symptoms are caused by retinal detachment or bleeding into the vitreous gel.
• Partial or total loss of vision, or a shadow or veil across your field of vision. These symptoms also are caused by retinal detachment or bleeding in the vitreous gel.
• Pain in your eye, which can be caused by neovascular glaucoma.

For more information, see the topic Diabetic Retinopathy.

Heart and large blood vessel disease

You may develop macrovascular disease because of diabetes, but you may not have any symptoms until you have a heart attack or stroke or develop peripheral arterial disease.

Symptoms of coronary artery disease include:

• Chest pain.
• Shortness of breath with exertion.
• Nausea, and discomfort that feels like heartburn.
• Fatigue.

Symptoms of transient ischemic attack (TIA)-a temporary interruption of blood flow to part of the brain and a warning sign of an impending stroke-include:

• Weakness on one side of the body, or inability to move a part or all of one side of the body, such as the face, arm, and leg.
• Numbness, tingling, or a feeling of heaviness.
• Difficulty speaking or understanding words.
• Loss of vision or changes such as blurring or double vision.

Symptoms of peripheral arterial disease include:

• Intermittent claudication, a tightness or squeezing pain in the calf, thigh, or buttock during exertion, such as walking.
• Decreased leg strength and poor balance when standing.
• Cold and numb feet or toes.
• Loss of hair on the feet or legs.

Erection problems (erectile dysfunction) can be an early warning sign of blood vessel disease and may indicate a higher risk of heart disease.

For more information, see the topics Coronary Artery Disease, Heart Attack and Unstable Angina, Peripheral Arterial Disease of the Legs, Stroke, and Transient Ischemic Attack (TIA).

Nerve damage

Symptoms of peripheral neuropathy (affecting the nerves that control sensation, touch, and movement) include:

• Tingling, numbness, tightness, burning, or shooting or stabbing pain that starts in the feet and may spread to the legs, hands, and arms. Usually, symptoms develop in the toes first and are worse in the evening. Ulcers and infection may develop in the feet. Bone and joint deformities also can develop, especially in the feet (Charcot foot).
• Greatly reduced or greatly increased sensitivity to temperature changes and a sense of pain with light touch.
• Weakness and loss of balance and coordination.