Pain in the heel can be debilitating and severely affect daily activity. The most common cause of heel pain is plantar fasciitis, however, consideration for other causes should always be considered, these include nerve compression, inflammation of the fat pad and even stress fracture.
Diagnosis tends to be clinical, based on history/activity and symptoms followed by an assessment. This often enough to provide a very accurate diagnosis, sometimes imaging is used to confirm the diagnosis. Ultrasound examination is excellent for this purpose as it is quick and sensitive. It assesses the thickness of the plantar fascia as it arises from the heel bone, it can identify any tears or ruptures.