They can interfere with concentrating at school, socializing with friends or enjoying life. Next is how does anxiety affect teenagers? Anxiety disorder can be especially serious for young people because they are still developing. If left untreated, anxiety disorder in teenagers can have long term effect that can continue into adulthood. Sign off and the anxiety disorder include having unhelpful and negative thoughts, avoiding difficulty or new situation, being withdrawn, et cetera. Next, a type of anxiety in teenagers. Not all teenagers will have the same symptoms