Emotion

Emotion is a gameplay feature introduced in The Sims 4. Emotion is a core part of a Sims's simology. Emotion is similar to mood, but is more easily affected by in-game events and social interactions with other Sims. The current emotional state of a Sim is depicted in the lower left corner of the screen while playing. It is also noted that some objects in-game can affect the emotions of some Sims, though the Sim has to already be feeling a particular way in order for an object to affect them emotionally. Sims that are severely emotional can die from their emotions.

There are several ranges of emotions. Sims may reach one stage of an emotion and then progress to a second, more extreme stage of the same emotion. For instance, a Sim that is embarrassed may become very embarrassed. Sims that become extremely emotional may eventually suffer an emotional death.

Emotional states

 * Angry - Enraged - Furious : Negatively affects interactions, NPC Sims tend to be more aggresive, A punching bag can be used to relieve the Sim from the Emotion. Also, you can try to calm down an NPC Sim with the Emotional State. Currently Unknown.
 * Bored : Currently Unknown. Received randomly during social interactions with Sims.
 * Confident - Very Confident : Helps Social Related Performance. Increases the rate at which the Charisma skill is gained. Can be received from the Self-Confident trait when waking up, practicing speech in front of a mirror, brushing teeth or when winning a fight with a Sim.
 * Cranky : Currently Unknown, expected to improve a Sim's inventing abilities. Currently Unknown
 * Dazed : Currently Unknown. Can be received when losing a fight or being electrocuted.
 * Embarrassed - Very Embarrassed : Currently Unknown. Can be received from being humiliated in a discussion while multiple Sims are present.
 * Energized : Helps sports related performance. Can be received from drinking Energy Drinks, Jogging or taking a Brisk Shower
 * Fine : The default emotional state of a Sim. Happens when a Sim doesn't have any moodlets.
 * Flirty - Very Flirty - Passionate : Makes Sims better at romantic interactions. Can be received from Steamy Showers and successing in doing romantic social interactions.
 * Focused : Boosts Logic performance. Can be received from practicing Chess, using the telescope, microscope, reading a book or Browsing Simpedia on a PC.
 * Happy - Elated : Sim performs a happier variant of actions. Also boosts Social Performance. Can be obtained when Good Events happen, and when all the Needs are high.
 * Inspired : Helps Sims create better paintings, food, drinks and other craftable items. Can be received by taking a thoughtful shower, using the microscope and the telescope.
 * Hysterical : Negatively Impacts Social Interactions. Can be received when the Sim has low Social Need.
 * Playful - Very Playful : Helps with social interactions. Can be received from using friendly social commands on Sims.
 * Uncomfortable - Very Uncomfortable : Happens when a Sim has negative moodlets that derive from Low Needs.
 * Sad - Very Sad : Changes Sim's way to approach actions, also changes Sim's style of walk. Happens when a saddening events happens, like donating to charity but discovering the site is fake.
 * Tense - Stressed : Sim does the more stressful variants of actions. Can be received from having the Fun Need low.

Emotional death
Sims with prolonged and extreme emotions can die as a result of their emotions. There are several emotional deaths, but not every emotional state has an associated death. For example, Sims can die from embarrassment or laughter.

Emotional Related Actions
When having a specific emotion, you may unlock new interactions, but it only happens when having the emotion

For example, an energized Sim can do Push-Ups, Sit-Ups and Stretch Himself. A humiliated Sim may cry under his bed. An Uncomfortable Sim may complain about their problems to other Sims, and being Confident allows you to tell an Unbelievable Story to other Sims.