Sanity is a recurring theme in The Walking Dead. It is the ability to think and behave in a normal and rational manner. Many characters lose this ability during the zombie apocalypse. Typically, the loss of one's sanity is attributed to the death of a close family member, friend, or by a harrowing event.
- Shane slowly becomes insane; facing the fact that he will never have Lori and that Rick now runs the camp. (Days Gone Bye)
- Carol loses her sanity as no one talked to her and trusted her after her attempted suicide, wanting attention. (Comic Series)
- Michonne had talks with her dead boyfriend as a way of coping. (Comic Series)
- Rick loses his mind after the death of his wife and baby. (Issue 48)
- Morgan breaks down after the surprise death of his son. (Comic Series)
- Andrea talks to Dale's hat long after his death as a way of coping. (Comic Series)
- Negan is shown to be slightly unstable as he goes from being cocky and playful to being ruthless and narcissistic in an instant. (Something to Fear - Present)
- Negan breaks down in front of Maggie and begs her to shoot him in the head. (Issue 174)
- Andrea becomes careless after Amy dies for a brief period.
- Dr. Jenner tries to kill the Atlanta group, after losing hope in finding a cure. (TS-19)
- Daryl has a hallucination of his brother Merle in the forest after the group loses Sophia. (Chupacabra)
- Shane slowly loses his sanity after facing the fact that he will never have Lori and Carl for himself and that Rick now runs the camp, eventually leading to him attempting to kill Rick, three different times. (Wildfire - Better Angels)
- Hershel keeps a pocket-watch as a reminder of his family.
- Beth wants to commit suicide after the barn massacre.
- Hershel grows careless after the barn incident.
- Rick loses his sanity after learning of the death of Lori and begins to have hallucinations: having conversations with deceased people over the phone, seeing Shane as one of the Woodbury guards, and seeing hallucinations of Lori in her wedding dress and her previous clothing before her death. (Killer Within, Say the Word, Made to Suffer, The Suicide King, Home, This Sorrowful Life)
- Carl thinks about naming Judith by using names of previously dead group members.
- The Hermit seems to have lost his sanity due to threatening to call the cops after Rick and his group break in. (When the Dead Come Knocking)
- Michonne tells Rick that she used to have conversations with her dead boyfriend. (Home)
- The Governor becomes unhinged and bloodthirsty after the death of his daughter, Penny. (Made to Suffer)
- Morgan is seen to have lost his sanity after the death of his son at the hands of his undead wife, whom he finally had to put down. (Clear)
- Carl appeared to have lost much of his morals after the death of his mother. His thinking appeared to be radically different from that of a normal teenager after the final assault of The Governor's army at the prison. (Welcome to the Tombs)
- Lizzie is shown to suffer from a form of mental illness and posses psychopathic tendencies. (Season 4)
- Morgan slowly regains his sanity and a sense of purpose with the help of Eastman. (Here's Not Here)
- Ron Anderson finds himself in a psychotic state when he tries to kill Rick after witnessing the deaths of his mother and brother, blaming him for the misfortune his family suffered by meeting him. (No Way Out)
- Morgan suffers a mental breakdown after the loss of Benjamin and reverts back to his PTSD fueled insanity. (Bury Me Here)
- Rick's struggles to maintain his sanity after the loss of Carl. (Honor, The Lost and the Plunderers)
- Travis enters into a blind rage when he murders Brandon and Derek for killing his son, Chris. (Wrath)
- Clementine keeps her walkie-talkie as a way of coping with her thoughts regarding her parents.
- Katjaa attempts to save the person that Lee rescued despite Lilly wanting to throw them out.
- Lilly becomes paranoid after supplies were vanishing around the motor inn and ends up shooting Doug/Carley in a heated argument when interrogating Ben on the side of the road. (Long Road Ahead)
- Kenny slowly loses his sanity after Duck and Katjaa die. (Long Road Ahead)
- The Stranger becomes psychotic after Lee's group steals his family's supplies from his station wagon at the end of Episode 2 because this led to the death of his family, keeping his wife's zombified head inside a bowling bag. (Season 1)
- It is possible that Nate grows psychotic after his friend is shot by Eddie. (Wyatt's Story)
- Nate seems to lose sanity when he reveres the idea of killing the old couple in the diner, going as far as killing them regardless of what Russell has to say. (Russell's Story)
- Sarah loses her sanity after her father is devoured in front of her. She refuses to accept the fact that he is truly dead. (Amid The Ruins)
- Kenny begins to lose his sanity again after the loss of Sarita, Rebecca and Luke. (No Going Back)
- Marla seems to be going insane after referencing her son and repeating wanting to go to a better place. (Social Game)
- Philip Blake loses his sanity after his daughter, Penny is shot and killed. (Rise of the Governor)
- Brian Blake goes insane after the death of his brother, niece, and friend and pretends to be his brother. (Rise of the Governor)
- Mer Dupree suffers from mental problems and even commits suicide. (Descent)
- Jeremiah Garlitz manipulates people to follow him and commit suicide. (Descent, Invasion)
|Abstract||Betrayal • Cliffhangers • Denial • Depression • Distrust • Discrimination • Envy • Fear • Foreshadowing • Forgiveness • Humanity • Humor • Hope • Pride • Regret • Religion • Revenge • Sacrifice • Sanity • Secrecy • Teamwork|
|Realistic||Amputations • Cannibalism • Heroism • Leadership • Nicknames • Punishment|