**Side-note: The doctor seems to be the psychoanalyst in the play **
From a psychoanalytic approach, Lady Macbeth’s superego is overpowering the id and ego. In addition, Lady Macbeth's behaviours, such as sleepwalking, correlate with some psychological disorders.
The Doctor says, “Unnatural deeds. Do breed unnatural troubles; infected minds“, he refers to her guilty conscience as the infected mind. Furthermore, Lady Macbeth’s realization of doing wrong has awakened her superego’s morality.
Lady Macbeth hallucinates and sees a “[blood] spot” on her hands. This visual hallucination reveals her mental instability in her temporal lobe, which is responsible for visual and auditory input. However, Lady Macbeth’s visual hallucinations may also be correlated to mental disorders such as schizophrenia.
Sleepwalking is often caused by immense stress, but is also quite noticeable in schizophrenic patients. Furthermore, the visual hallucinations and sleepwalking may categorize her as a schizophrenic patient.
Lady Macbeth’s continuous attempts to wash away the imaginary “damned spot” (blood) is correlated to her feelings of remorse and mental instability.
In addition, as a result of her murderous acts, she is haunted by King Duncan and Banquo’s blood; therefore, her continuous need to get rid of the imaginary blood reveals that she thinks the murder has contaminated her soul and the blood has contaminated her hands. Furthermore, repetitive behaviour, such as her repetitive “hand rubbing”, is a sign of compulsive behaviour syndrome.
At a religious standpoint, Lady Macbeth’s hand washing appears to be a sign of salvation and the removal of sin, which is similar to water baptism. Furthermore, Lady Macbeth wants to access her superego, which is meant to represent God; therefore, her handwashing is a sign of her superego overpowering the id and ego.