For some it’s an actual neurological condition & for some it’s an emotional response. It depends on the person. But all these people in here stating it’s just an emotional reaction or it’s because your “not letting yourself” is too notch bullshit. It honestly pisses me off, I’ve been stuttering since I could talk I’ve had brain scans, CT scans & MRI’s. It’s an actual neurological condition. The people in here saying it’s not don’t actually have a stutter they have anxiety & get scared to talk. I’ve never had anxiety nor I’m I afraid to talk. I just have blocks in my speech. & no matter what I do how much practice I have it’s something I will always have.