Narcissistic personality disorder is a mental health condition in which people have an unreasonably high sense of own importance.

They need and seek too much attention and want people to admire them. People with this disorder may lack the ability to understand or care for the feelings of others.

Behind the extreme confidence, they are not sure of their self-worth and are easily upset by others.

OCD is a mental health condition where a person has obsessive thoughts and compulsive behaviours:

• an obsession is an unwanted and unpleasant thought, image or urge that repeatedly enters your mind, causing feelings of anxiety, disgust or unease;
• a compulsion is a repetitive behaviour or mental act that you feel you need to do to temporarily relieve the unpleasant feelings brought on by the obsessive thought.

OCD can be distressing and significantly interfere with your life, but treatment can help you keep it under control.

Bipolar disorder is a mental health condition where you have extreme mood changes. You sometimes have either:

• high moods (mania or hypomania) - feeling very happy, excited or energetic;
• low moods (depression) - feeling sad, tired or hopeless.

These moods can last a few days or weeks at a time. Medicines and talking therapy can help manage it.

Trauma is when we experience very stressful, frightening or distressing events that are difficult to cope with or out of our control. It could be one incident, or an ongoing event that happens over a long period of time.

Trauma can cause strong feelings and difficult experiences and can take time and support to be able to cope. 

ADHD is a condition where the brain works differently to most people, and may cause you trouble with things like concentrating and sitting still.

Symptoms of ADHD involve your ability to pay attention to things, having high energy levels, and your ability to control your impulses.

There are things you can do to help you manage your symptoms.

Suicide is the act of intentionally taking your own life. Suicidal thoughts can mean:

• having abstract thoughts about ending your life;
• feeling that people would be better off without you;
• thinking about methods of suicide;
• making clear plans to take your own life.

Schizophrenia is a long-term mental health condition which causes a range of different psychological symptoms.

Doctors often describe schizophrenia as a type of psychosis, which means the person may not always be able to distinguish their own thoughts and ideas from reality.

Symptoms can include hallucinations, delusions, muddled thoughts and feeling disconnected.

People with schizophrenia do not have a split personality and schizophrenia does not usually cause someone to be violent.

Autism is not an illness or disease, it means your brain works in a different way from other people. Common signs of autism in adults include:

• finding it hard to understand what others are thinking or feeling;
• getting very anxious about social situations;
• finding it hard to make friends or preferring to be on your own;
• seeming blunt, rude or not interested;
• finding it hard to express your feelings;
• taking things very literally;
• having the same routine every day and getting very anxious if it changes.

It is not a medical condition with treatments or a "cure", but some people need support to help them with certain things.

Post-traumatic stress disorder (PTSD) is a mental health condition caused by very stressful, frightening or distressing events.

Someone with PTSD often relives the traumatic event through nightmares and flashbacks, and may experience feelings of isolation, irritability and guilt.

These symptoms are often severe and persistent enough to have a significant impact on the person's day-to-day life.

Addiction is defined as not having control over doing, taking or using something to the point where it could be harmful to you.

It is most commonly associated with gambling, drugs, alcohol and smoking, but it is possible to be addicted to just about anything, including:

• work;
• the internet;
• solvents;
• shopping; 
• sex.

The strain of managing an addiction can seriously damage your worklife and relationships. Addiction is a treatable condition.

Depression is more than simply feeling unhappy or fed up for a few days. When you are depressed you feel persistently sad for weeks or months, rather than just a few days.

Depression affects people in different ways and can cause a wide variety of symptoms: lasting feelings of unhappiness and hopelessness, losing interest in the things you used to enjoy and feeling very tearful.

There can be physical symptoms too, like feeling constantly tired, sleeping badly, having no appetite or sex drive, and various aches and pains.

At its mildest you may simply feel persistently low in spirit, while severe depression can make you feel suicidal.

With the right treatment and support, most people with depression can make a full recovery.