According to your father's sign and symptom he is suffering from edema like swelling on the feet .
You want to know the reason of that.
Next Steps
Please take consultation for better evaluation and best Treatment
Health Tips
Please follow good life style as
take plenty of fluid and
take less spicy and fatty foods and
take protein containing food and
do breathing exercise regularly and
Do yoga and meditation and
keep positive attitude to fight any disease and any problem of your life.