Major depressive disorder

Very common

Mental health disorder having episodes of psychological depression.

Symptoms may include:

• Sadness
• Hopelessness
• Apathy

Seasonal affective disorder

Very common

A type of mood disorder associated with seasonal changes. Commonly seen as depression arising during the winter months. It happens due to a disturbance in the circadian system of the body.

Symptoms may include:

• Feeling depressed on most days
• Apathy
• Reduced energy

Dementia

Very common

A group of symptoms that affects memory, thinking and interfers with daily life.

Symptoms may include:

• Memory loss
• Difficulty in communication
• Apathy

Huntington's disease

Rare

A condition that leads to progressive degeneration of nerve cells in the brain that affects movement, cognitive functions, and emotions.

Symptoms may include:

• Involuntary jerking
• Rigidity of muscles
• Irritability, apathy

Schizophrenia

Very common

A mental disorder characterized by delusions, hallucinations, disorganized thoughts, speech and behavior.

Symptoms may include:

• Delusions
• Hallucinations and illusions
• Apathy

Alzheimer's disease

Very common

A type of brain disorder that causes problems with memory, thinking and behavior. This is a gradually progressive condition.

Symptoms may include:

• Memory loss
• Confusion
• Apathy
• Difficulty with self care

Generalized anxiety disorder

Very common

A condition with exaggerated tension, worrying, and nervousness about daily life events.

Symptoms may include:

• Uncontrollable worry and nervousness
• Trouble sleeping
• Irritability
• Apathy

Hypothyroidism

Common

A condition resulting from decreased production of thyroid hormones. The symptoms vary between individuals.

Symptoms may include:

• Weight gain
• Increased sensitivity to cold
• Dry skin and hair
• Apathy

Bipolar disorder

Very common

A serious mental illness characterized by extreme mood swings. They can include extreme excitement episodes or extreme depressive feelings.

Symptoms may include:

• Excessive crying, sadness
• Extreme happiness, excitement
• Apathy...