Interoception:

Interoception, in contrast of exteroception, refers to internal sensory perception involving the general senses — changes in temperature, tension, pain, heartrate, or respiration creating sensations of hunger, thirst, feeling well/unwell, or sleepy. Evidence suggests high/low interoception in one domain doesn’t mean overall high/low interoception (high recognizing hunger sensations, but low recognizing emotions). Studies of interoception and mental health show being too aware of but misinterpreting internal body sensations can contribute to anxiety disorders. Other links are being researched between interoception and depression, OCD, trauma disorders, substance use, and suicidality. Interoceptive features also reflect emotional valence/arousal — often considered to be a “sixth” sense key to understanding internal sensations on a moment-to-moment basis:

• Interoceptive sensitivity (accuracy) is objective, measurable performance in detecting internal bodily signals (how accurately can a person count their heartbeats in a time period).
• Interoceptive sensibility is the subjective self-perception, beliefs, and attitudes about how accurately or frequently they sense their internal body signals (measured via self-report questionnaires).
• Interoceptive awareness is a metacognitive measure of the correspondence between objective accuracy and subjective sensibility (how well perceived ability matches actual performance). 
• Interoceptive Avoidance: With effort, we can avoid external stressors, but it’s harder to avoid our body sensations — like a faster heartrate, dizziness, sweating, or stomach or back pain. Misinterpreting body sensations can trigger emotional/ physiological reactions of fear/anxiety — which motivate what’s called interoceptive avoidance and safety behaviors to protect us from danger in the moment. Long-term, however, avoidance results in ineffective and harmful behavioral changes. Avoidance and safety behaviors may prevent learning the true nature of the threat and unnecessarily prolong fear.
• High interoception is eating when hungry or breathing deeply when feeling a racing heart.
• Low interoception is going without eating or having acute anxiety in fear of a heart attack.