The term for the fear of closed spaces is "claustrophobia." This anxiety disorder can cause significant distress when individuals find themselves in confined environments, such as elevators, tunnels, or small rooms. People with claustrophobia may experience symptoms like rapid heartbeat, sweating, trembling, and feelings of panic when faced with these situations. The severity of the condition can vary from person to person, with some able to manage their fears while others may avoid certain places altogether. Treatment options often include therapy, medication, and gradual exposure to triggers to help reduce anxiety and improve coping mechanisms.