Foot Pain Diagnosis More Condition_symptoms Elderly Lady Has Severe Foot Pain, What Can This Be?

Elderly lady has severe foot pain, what can this be? - foot pain diagnosis more condition_symptoms

The pain is constant and burning. It starts below the ankle and feel tense, as if bound. It is about using ultrasound, but wondered if anyone can diagnose these symptoms. She saw many doctors, but has not yet received a final diagnosis.