We most often feel uncomfortable if compliments catch us by surprise. When we're surprised, we move through the following sequence:

• Stage 1: We momentarily freeze. Rising dopamine levels may cause the heart to start racing and palms sweating. This intense emotional experience can feel uncomfortable.
• Stage 2: We find an explanation for what is happening.
• Stage 3: We shift the new information so that it fits our existing schema about ourselves. This means we may try to deflect the compliment or shut it down.
• Stage 4: We share our experience.

Many people squirm in their seats when someone's compliment catches them off guard.

A study of more than 400 people showed that 70% associated receiving a compliment with feelings of embarrassment or discomfort.