Recognised Mental Ill-Health Conditions and Their Symptoms According to Current Classification Systems

Anxiety disorders: These include conditions like Generalised Anxiety Disorder (GAD), Panic Disorder, and various phobia-related disorders. Symptoms for these disorders may include excessive worrying, a feeling of impending doom, insomnia, restlessness, and panic attacks.
Mood disorders: This category includes conditions such as depression and bipolar disorder. People with these may experience long periods of extreme sadness, loss of interest in everyday activities, abnormal sleep patterns, and in the case of bipolar disorder, episodes of mania where they may feel overly excited or energetic.
Psychotic disorders: The most notable of these is schizophrenia, where individuals may experience symptoms such as hallucinations, delusions, speech that does not make sense, and a lack of motivation or emotions.
Eating disorders: These can include conditions like anorexia nervosa, bulimia nervosa, and binge-eating disorder. Symptoms for these disorders typically involve an obsession with food, body weight, or body shape, and can include excessive weight loss, overeating, or self-induced vomiting after meals.
Personality disorders: Examples include antisocial personality disorder, borderline personality disorder, and narcissistic personality disorder. Symptoms may include difficulty maintaining relationships, an inability to empathise with others, and a pattern of violating the rights of others.
Post-traumatic Stress Disorder (PTSD): This can occur after a person has experienced a severe trauma. Symptoms can include flashbacks of the traumatic event, avoidance of things or places that remind them of the trauma, and heightened reactions, like feeling constantly on guard.
Obsessive-Compulsive Disorder (OCD): This includes symptoms like uncontrollable, recurring thoughts (obsessions) and behaviours that the person feels the need to repeat over and over (Compulsions).
Attention-deficit/hyperactivity disorder (ADHD): This entails symptoms like lack of attention, hyperactivity, or impulsive behaviour.
Autism Spectrum Disorder (ASD): Symptoms can include persistent difficulties with social communication and social interaction, and restrictive and repetitive patterns of behaviours, activities, or interests.

Remember that the above-listed symptoms are not exhaustive, many of these conditions can display varying symptoms from person to person. It is vital that you have a good grasp of the basics, but also understand that mental health is diverse and complex.