Sometimes injuries are not obvious. You can suffer some common running injuries while running and not be aware. Its only when you go out for your next run that you discover that your calf, knee or ankle is not well.
It happened to me after my first marathon. Six months after the marathon I returned to running and the first thing I realized was my knee was in pain. For those six months of rest I never felt a sign that I was suffering from runners knee. Many runners after running a marathon return home and get on with life, its only when they get back running that they discover a knee, calf or ankle is not well.
Why you Might not feel the pain.
Runners can carry an injury and not be aware of the injury because most injuries are felt when we apply effort. When you are walking you wont feel anything is amiss but when you try an activity that requires an effort like going up or down a staircase you will feel pain.
Detecting Hidden Injury
If you have ever suffered a pain and visited a doctor, the first thing a doctor does is to press the place you show him. Pressing is the only way a doctor can confirm whether its the correct place.
As for runners, If you bother to stretch or massage your legs after a run you might be able to detect a hidden injury. If you massage your calf’s or stretch your ankles and feel unbearable pain, it is a sign the joint or muscles has taken too much beating and needs treatment. That is why I always make sure I stretch and massage after my runs.