noun
stage fright; social anxiety disorder; social phobia
Refers to a tendency to get extremely nervous in front of others, such as when giving a speech or performing. Often used in casual self-description.
彼はあがり症で、人前で話すのが苦手だ。
He has stage fright and is not good at speaking in public.
あがり症を克服するために、プレゼンの練習をし
I'm practicing presentations to overcome my social anxiety.
緊張 is general nervousness or tension, while あがり症 specifically refers to a chronic condition of freezing up or panicking in social performance situations.
対人恐怖症 is a clinical term for social anxiety disorder (taijin kyofusho), whereas あがり症 is a more colloquial, less severe term often used for everyday stage fright.
Compound of 上がり (あがり, 'rising' or 'getting nervous', from 上がる) and 症 (しょう, 'condition/syndrome'). The exact origin is uncertain, but it likely emerged in colloquial Japanese to describe a common social anxiety.