Psychosis doesn’t have a single cause. It’s usually the result of a mix of factors, including genetics, environment, trauma, physical health, and drug use.

The main causes of psychosis

Genetics

A family history of psychosis or mental health conditions can increase your risk. But having a relative with psychosis doesn’t mean you’ll experience it yourself.

Environment and life events

Stressful life events, such as losing a loved one, abuse, or neglect, can play a part. Social isolation and poor family relationships are also risk factors.

Physical health problems

Some physical conditions, like a brain tumour or certain infections, can cause psychosis.

Trauma

Experiencing trauma, especially in childhood, can increase the risk of developing psychosis later in life.

Drug use

Using psychoactive or recreational drugs, such as cannabis, LSD, or amphetamines, can trigger psychosis, especially in young people.

It’s about risk, not certainty

These factors can increase the risk of psychosis, but they don’t guarantee it will happen. Everyone’s experience is different.

What should you do if you’re concerned?

If you’re worried about your mental health, or someone else’s, it’s important to seek support from a healthcare professional. Early help can make a real difference.