how do you know when a toddler has a headache?

how exactly do you know if your toddler happens to have a headache? What are some behavior signs or signs in general? I read somewhere that babies and toddlers can get headaches.

    I know when it seems like my sons head hurts he will rub or hold his head or sometimes pull on his ears. Plus he just gets this look in his eyes that lets me know something is wrong.
      My little ones will rub their heads a lot. Tell me owie. They get circles around their eyes like they have black eyes.
        I didn't know about the "black eye" thing. Interesting. Adults seem to look very tired and have dark circles when they have headaches too, so it makes sense.
        About Aundreya
        Birth: July 24
        On since: Jan 9, 2014
        I got pregnant at 18, had him month after I turned 19. Currently 21. I work full time, full time student and full time momma to Mr. Carter Layne Kennedy. He was born august 23rd,2012. Was born 2w3d early. 6lbs 7oz 21in. I had a VERY hard pregnancy.