What does a panic attack feel like? what causes them?

Panic attack: Some things which can ^ risk for panic attacks include: previous abuse/ trauma as well as genetic predisposition. Traumatic brain injury, hyperthyroidism, hypoglycemia, mitral valve prolapse, recurrent hyperventilation, extreme physical activity, drug abuse & use of stimulants may ^ risk. Acute stressors or chronic stress, illness, claustrophobia & major life changes can also play a part. Panic >