The pain is a mixture of sensations, including heat and cold, burning, tingling, numbness,
and sharp stabbing
and underlying aching pain. It is intense in the area affected by the
stroke, such as the face, extremities or trunk on one side, and is made worse by movement and temperature changes, especially cold temperatures."
https://www.ninds.nih.gov/health-information/disorders/stroke
What kind of rehabilitation therapy does he do? Physical or occupational therapy?