The term for the fear of enclosed spaces is "claustrophobia." This anxiety disorder is characterized by an intense fear or discomfort when in small or confined areas, such as elevators, tunnels, or crowded rooms. Individuals with claustrophobia often experience physical symptoms like sweating, rapid heartbeat, and panic attacks when faced with situations that trigger their fear. Treatment options, such as cognitive-behavioral therapy, exposure therapy, and relaxation techniques, can help individuals manage and overcome their fears, allowing them to navigate environments typically perceived as threatening.