Common symptoms of brain tumours include crippling headaches, seizures and nausea.
But there are other lesser-known signs that you may have a potentially cancerous mass growing within your brain.
This can include hearing voices and excessive growth spurts.
Brain tumours kill more children and adults under the age of 40 than any other cancer, according to the Brain Tumour Research charity.
Here, MailOnline reveals five strange warning signs of a brain tumour.
There are more than 120 different types of brain tumours meaning the symptoms vary a lot. Hearing voices, losing interest in hobbies, forgetfulness, blurry vision and growth spurts especially in the hands and feet are all warning signs of a brain tumour
Loss of interest in hobbies
Suddenly losing interest in your favourite hobby may be a warning sign of a brain tumour.
One in three people with a brain tumour experience a personality change of some kind, according to The Brain Tumour Charity.
This can be in the form of a loss of interest in a hobby.
When a tumour grows in the brain, it can put pressure on healthy cells around it.
If it develops in the frontal lobe, the area that controls emotions, personality and behaviour, you can even start acting strangely.
A tumour on the pituitary gland can also cause personality changes such as depression and anxiety, says the charity Brain Tumour Research.
Dr Karen Noble, director of policy, research and innovation at Brain Tumour Research, said: ‘Brain tumours near the pituitary gland can cause some of the most surprising symptoms, such as extreme changes to personality, weight and physical size, or delays to puberty.
‘This is due to the tumour affecting the levels of hormones the gland produces.’
But it is important to catch these symptoms early.
Only 40 per cent of brain cancer patients live more than a year after diagnosis and only 20 per cent survive five years, data suggests.
Extreme growth spurts
Tumours affecting the pituitary gland can also, in rare cases, cause extreme growth spurts in adults as well as children.
Some tumours that affect the pituitary gland make hormones, according to Cancer Research.
This production of hormones can cause growth spurts in young people.
But these growth spurts are not just in children, they can happen in adults too.
This unusual surge in size can cause the hands, feet or even the lower jaw to grow in adults, experts say.
Dr Noble said: ‘Early detection and treatment may avoid complications later on; however brain tumours are often misdiagnosed, which can delay this.
‘There are over 120 different types of brain tumour and the symptoms are numerous and varied – depending on where in the brain the tumour is positioned.’
Growth spurts can be a sign of a brain tumour on the pituitary gland. But these growth spurts are not just in children, they can happen in adults too. This unusual surge in size can cause the hands or feet to grow, experts say
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