Etrog (Citron) corresponds to the three sefirot of conscious emotion in the heart, which are Generosity ( Chesed ), Discipline ( Gevurah ), and Beauty (Tiferet )*, and so it inherits the following attributes:

Body : Right shoulder, arm, and hand.
Kabbalistic Attribute : Unconditional generosity and loving kindness.

Emotional Expression : Love, spontaneity, and positive regard.
Mental Expression : Judging to the side of merit.
Spiritual Expression : Love of God, love of truth, and love of creation.

Etrog's Healing Correspondences -Chesed
(When combined with Wheat)

Balanced, Rectified, God-Centered Expression: Giving because God's creatures are in need and He has assigned us the responsibility of being His agents in tending to those in need.

When Contaminated by Serpent (Ego) Consciousness: Giving as a form of exerting control and manipulation in order to get people to like you or make them beholden to you.

Pathological Expression: Narcissistic Personality Disorder where the expansiveness of Chesed gets hijacked by the ego and twisted into an overly generous self-image and an inflated sense of self-importance. (Narcissistic Personality Disorder is defined as a pervasive pattern of grandiosity (in fantasy or behavior), need for admiration, and lack of empathy.)

Too Little on the...

Emotional Plane: Non-relational, cold, lacking in passion, warmth and generosity.

Mental Plane: Blind generosity and universalism to the point that one justifies and even nurtures evil. Inability to recognize distinctions. Inability to prioritize giving. Inability to identify moments where the proper response is “tough love.”

Mental Plane: Habitually assuming the worst about people. Critical in one's judgments.

Spiritual Plane: Feeling so secure in God's unconditional love that one stops being rigorously careful about one's reciprocal obligations (be they moral or religious).

Spiritual Plane: Dispassionate and impersonal relationship with God.