Thanks for your query. I am Dr Akshay from Fortis Hospital, New Delhi.
Left Heel pain
is most probably due to Plantar Fascitis in this age group. You need to modify your footwear and do some physical therapy.
Can take a short course anti-inflammatory medications but that depends upon your other history
Do not hesitate to contact me if you need any further assistance.
Thanks & Regards
Dr Akshay Kumar Saxena