Different types of mental illnesses :

 Anxiety Disorders (e.g., Generalized Anxiety Disorder): Characterized by excessive and persistent worry and fear about everyday situations, lasting for at least 6 months.

 Panic Disorder: Characterized by sudden and repeated episodes of intense fear or panic (panic attacks), followed by at least 1 month of persistent worry about having more attacks or their consequences.

 Depressive Disorders (e.g., Major Depressive Disorder): Marked by persistent feelings of sadness, loss of interest, and a significant change in mood and behaviour, lasting for at least 2 weeks.

 Bipolar Disorder (e.g., Bipolar I): Involves extreme shifts in mood, with at least one manic episode lasting for a minimum of 7 days or requiring hospitalization. Depressive episodes, which also occur, must last at least 2 weeks.

 Schizophrenia: A chronic disorder that affects a person's ability to think, feel, and behave clearly, with symptoms present for a significant portion of at least a 1-month period, and continuous signs of disturbance for at least 6 months.

 Obsessive-Compulsive Disorder (OCD): Features unwanted, recurring thoughts (obsessions) and repetitive behaviours (compulsions) that are time-consuming (more than one hour per day) or cause significant distress, and have been present on most days for at least 2 successive weeks.

 Post-Traumatic Stress Disorder (PTSD): Develops after experiencing or witnessing a traumatic event, with symptoms of intrusion, avoidance, negative changes in thinking, and altered arousal lasting for more than 1 month after the trauma.

 Alcohol/ tobacco/ cannabis Use Disorder: A problematic pattern of use of any volatile substance leading to significant impairment or distress, with a diagnosis based on a problematic pattern of use occurring within a 12-month period.

 Eating Disorders (e.g., Anorexia Nervosa): Involve severe disturbances in a person's eating behaviours and related thoughts, with no specific time duration for diagnosis, but rather a persistent pattern of behaviour leading to significant health consequences.

 Personality Disorders: A group of disorders characterized by a rigid and unhealthy pattern of thinking, functioning, and behaving that has been stable and of long duration, typically beginning by late adolescence or early adulthood.

 Attention-Deficit/Hyperactivity Disorder (ADHD): A neurodevelopmental disorder marked by persistent patterns of inattention or hyperactivity-impulsivity that have been present for at least 6 months.

 Autism Spectrum Disorder (ASD): A neurodevelopmental condition that affects communication, social interaction, and behaviour, with symptoms typically appearing in the first two years of life.

 Internet Gaming Disorder (Under Study): A pattern of persistent or recurrent gaming behaviour that causes significant distress or impairment, with a diagnosis requiring at least five of nine symptoms within a 12-month period.

 Internet and Social Media Addiction: While not formal diagnoses, these terms are used to describe a problematic pattern of internet or social media use that causes clinically significant distress or impairment, often leading to a neglect of other important life areas. There are no official time duration criteria for these as of yet.

 Dementia: A general term for a decline in mental ability severe enough to interfere with daily life, where symptoms represent a significant decline from a previous level and are persistent and progressive over time.