One of the most common symptoms of extensor tendonitis, regardless of where it occurs, is pain. This is usually localized to the top of the foot, closer to the center of the foot. You may also experience redness, warmth, or swelling near the injury.
This condition is usually accompanied by increased discomfort with activity. Another way to tell if you have extensor tendonitis is a crunchy feeling or sound over the affected tendon. You may also find that your joints are stiff.