Diabetic foot disease

is caused by a combination of factors, including:

High blood sugar: High blood sugar can damage nerves and blood vessels, which can lead to poor circulation and numbness in the feet. This makes it more difficult to feel injuries and infections.
Decreased sensation: Numbness in the feet can make it difficult to feel injuries, which can lead to them getting worse.
Poor circulation: Poor circulation can slow down the healing process of injuries, which can also lead to them getting worse.
Symptoms of DFD can include:

Numbness in the feet
Pain in the feet
Redness or swelling in the feet
Open sores or ulcers on the feet
Infections on the feet