Years of wear and tear can take a toll on your knees. If you have experienced pain dull, achy, or sharp knee pain while standing, chances are that your pain is being caused by one of three conditions.
If you have been an athlete in the past, the chances of your developing one of the three are even higher. These common conditions that often start off as a mere nuisance can turn into more serious conditions if they are not treated in a timely fashion.
Source: Verywell Health