Uncontrolled excitement, also known as HYSTERIA, is an emotional state characterized by intense excitement and a lack of control. It is often accompanied by physical symptoms such as trembling, shaking, and rapid breathing. HYSTERIA is usually caused by a sudden surge of intense emotion, such as fear or joy. It can also be caused by a traumatic event or a stressful situation. HYSTERIA can be both positive and negative, depending on the context in which it occurs.