They can also occur in adults but are extremely rare. Like most brain tumours the cause of medulloblastoma is unknown. Research continues into finding possible causes. This may be due to a blockage in the ventricles of the brain which leads to a build up of CSF or by swelling around the tumour itself. Raised intracranial pressure can cause headaches, vomiting and visual disturbances.
Vomiting is common first thing in the morning.
Children often appear lethargic and irritable. Changes in personality and behaviour may also be noticed. As the cerebellum is the part of the brain which controls muscle coordination a tumour in this area may give rise to problems with walking. A person may appear to stumble or walk in an awkward or un-coordinated way. Speech can also be affected and words may appear slurred or muddled.