A moodlet is an icon that appears in a Sim's moodlet area after experiencing a specific situation, be it a change in needs, an interaction with another Sim, a food eaten, and so on. Moodlets can have a positive, negative, or neutral effect to the Sim's overall mood.

• Aching Back - Can occur for a number of reasons. Can be cured with a massage.
• Adrenaline Rush - While having this moodlet, the Sim will run instead of walk. It can occur if the Sim is a daredevil and does a "Watch This" interaction.
• Adventuring - An adventurous Sim who explores a tomb gets this moodlet.