How do you know if you injured a muscle?

I get stopped all the time by very worried people, “I was working out and now this muscle hurts, did I injure it.” 

Most of the time, all they’ve done is stained the muscle or maybe over work something but in a day or two the pain will go away. 
 
I love hearing how people injure themselves...for instance, I had a mom of 4 call me very anxious that she could’ve just pulled a muscle in “my knee or maybe just the back of my leg.” “I can’t stand on my leg without pain. I don’t have time to see the doctor, let alone have surgery.”  I asked her what happened?

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