Confusion may range from mild to severe. A person who is confused may:
- Be unable to express his or her thoughts clearly.
- Behave in an unusual, bizarre, or aggressive manner.
- Have trouble solving problems and performing simple tasks.
- Not know where he or she is. Be unable to recognize family members or familiar items.
- Express firmly held but false beliefs (delusions).
- See, hear, feel, smell, or taste things that are not really there (hallucinations or illusions).
- Believe that others want to harm him or her (paranoia).