Brain tumours happen when cells grow in the brain and multiply abnormally and uncontrollably.
There are two types of brain tumour: cancerous – otherwise known as malignant – and non-cancerous – otherwise known as benign.
Cancerous brain tumours are more dangerous, but non-cancerous tumours can still be very serious.
Over 9,000 people in the UK are diagnosed with a brain tumour each year, but they regularly go unnoticed for a long period of time.
According to Ian Sabin, consultant neurosurgeon and medical director at the London Gamma Knife Centre, part of HCA Healthcare UK, brain tumour symptoms are very general and are often not considered serious by people experiencing them, leading to late diagnosis.
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Sabin advises on five early warning signs of a brain tumour to watch out for.
Headaches
Headaches that are severe, persistent and not related to an existing illness are one symptom of a brain tumour.
Sabin notes headaches may be present when waking in the morning and often improve once you are up and about.
They may also cause vision to be disturbed when rising from a sitting position, alongside a feeling of faintness.
Nausea or vomiting
Nausea or vomiting is a fairly late sign in most people, but can sometimes be an early symptom of a small tumour which is interfering with the circulation of brain fluid.
If associated with headaches and drowsiness, seek medical help.
Cognitive changes
Cognitive changes include things like loss of initiative, aggressiveness, confusion, problems with reasoning and memory, and changes in personality.
These changes are often gradual, causing some people to be diagnosed with dementia, when the true cause is sometimes a large tumour compressing the frontal lobes of the brain.
Seizures or fits
Symptoms of seizures and fits can include twitching and jerking of muscles, blackouts, tongue biting, loss of bladder control, becoming unaware of your surroundings and strange sensation in the pit of the stomach.
Loss of specific functions
Some tumours may press on the nerves of hearing and balance, leading to loss of hearing and balance disturbance.
Others may press on the optic nerves, leading to loss of vision in one or both eyes, or damage sense of smell due to pressure on the nerves at the base of the skull.