Hello,
Extreme coldness in the shin & feet are commonly due to
peripheral vascular disease, diabetes,
arteriosclerosis, etc.
It is due to decrease in the blood circulation in the arteries or narrowing of the arteries due to fatty deposits that decrease the blood flow.
You are suggested to get him clinically examined by a GP. Get all the blood workouts, Urinalysis, CT, MRI, Nerve conduction tests, etc done at the earliest.
He should also get
cholesterol tests, chest x-ray, Duplex scanning, an
echocardiogram, an electrocardiogram (ECG or EKG), an exercise
stress test done to detect arteriosclerosis.
If diabetic, get blood glucose level controlled at every cost. Neglect may trigger the symptoms. His vitals should be normal.
His treatment will depend on the pathology detected, reports of the investigations obtained & his clinical condition. In the meantime give him vitamin D, vitamin E, B6, B12 rich food or its supplements.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr. Nupur K