The main takeway for me when watching this video is that the throat chakra is tied to authenticity - being your authentic self. If the throat chakra is blocked then it will manifest in you not following an authentic path. That wasn't all that was in the video, but that's what struck me as most interesting to me.
Another symptom that I learned was that a blocked chakra can by evidenced by not telling the truth. Not necessarily pathological lying, but well, lying. Maybe even to be nice some people don't tell the truth (to avoid hurting someone's feelings).
And then there are the physical symptoms like thyroid problems.
Take a look at the video if you want to better understand what kinds of problems can come with a blocked or weak throat chakra.