Thank you for proposing your query.
What is your age, height and weight? Because your history suggests you are suffering from Osteoarthritis
of Knee, which is a degenerative disease where in the protective cartilage
on the ends of your bones wears down over time with advancing age.
I would suggest you, not to ignore it and get yourself examined by a competent Orthopedician who after a comprehensive physical examination and knee x rays will confirm it. Once confirmed, your treatment plan will be devised accordingly. Avoid walking heavily and try losing weight if you are overweight
. Quit smoking
if you do.
Hope this answers your query.
Wish you Good Health.