I can provide information based on what I've been trained on.
For individuals with anxiety disorders, anxiety attacks, also known as panic attacks, can indeed seem to come out of nowhere or "creep up" on them. Panic attacks are sudden and intense surges of fear or panic that can be accompanied by physical symptoms such as a rapid heartbeat, shortness of breath, trembling, sweating, dizziness, and a feeling of impending doom or loss of control.
These attacks can be triggered by various factors, including stress, certain situations, phobias, or even seemingly unrelated events. Sometimes, the triggers might not be immediately apparent to the person experiencing the attack, making it feel like it came out of the blue.
For individuals with anxiety, it's essential to work with mental health professionals to understand their triggers, coping mechanisms, and strategies to manage anxiety and panic attacks effectively. Therapies like cognitive-behavioral therapy (CBT) and relaxation techniques can be helpful in reducing the frequency and intensity of anxiety attacks. Additionally, lifestyle changes such as regular exercise, a balanced diet, and sufficient sleep can contribute to overall anxiety management.