The crossword solution for the term 'Swelled Head Cause' is EGO, which stands for an exaggerated sense of self-importance or self-esteem. EGO is a psychological concept that refers to a person's sense of self-worth and identity. It is often seen as a defense mechanism against feelings of insecurity and inadequacy. People with an inflated EGO tend to overestimate their abilities and accomplishments, and may be overly confident in their decisions and actions.