Yes, there is an anxiety disorder that can cause a person to feel claustrophobic when there are "too many" people in a small space. This condition is known as "agoraphobia."
Agoraphobia is an anxiety disorder characterized by a fear of situations or places where escape might be difficult or embarrassing, or where help may not be readily available. While it is commonly associated with fear of open or public spaces, it can also involve fear of crowded or confined spaces, such as crowded rooms, public transportation, or busy shopping malls.
Individuals with agoraphobia often avoid these situations or endure them with intense anxiety because they fear being trapped, not being able to leave, or experiencing a panic attack in such circumstances. This fear can lead to significant distress and can interfere with daily activities and social interactions.
The interesting aspect you described about enjoying being in tiny spaces could be due to the perceived control and predictability that small spaces offer. In small spaces, the person may feel more in control of their environment, which can alleviate anxiety. However, when the same small space becomes crowded with too many people, it may trigger feelings of being overwhelmed, trapped, or out of control, leading to claustrophobia-like symptoms.
It's important to note that agoraphobia can vary in severity and presentation from person to person. Some individuals may experience it primarily in open spaces, while others may be more affected by crowded or confined spaces. Regardless of the specific triggers, agoraphobia can significantly impact a person's life and well-being.
If you or someone you know is experiencing symptoms of agoraphobia or any other anxiety disorder, it's essential to seek professional help. A mental health professional can provide a proper diagnosis and develop an individualized treatment plan, which may include therapy (such as Cognitive-Behavioral Therapy) and, in some cases, medication to manage anxiety symptoms. Early intervention and support can lead to better outcomes and improved quality of life.