Breathing Problems

• People who experience claustrophobia may experience breathing problems, including shortness of breath or hyperventilation, that may feel similar to those of a panic attack.
  
  

Sudden Illness

• People with claustrophobia may get physically ill, including feeling nauseous, vomiting and developing a rapid heartbeat.
  
  

Anxiety

• Another sign can be geeling anxious even while just thinking about being in a small or enclosed space.
  
  

Neurological Changes

• People with claustrophobia often experience neurological changes, such as trembling, sweating or feeling dizzy while in a small or enclosed space.
  
  

Avoidance

• According to the Mayo Clinic, people with claustrophobia often avoid going to particular places or events to reduce the possibility of being in an enclosed or small space.
  
  

Mood Changes

• People with claustrophobia have sudden mood changes such as panic, fear or sheer terror while in small or enclosed spaces.