Could it have spread to the brain?

Less than one minute read time.
Hi My mum has sclc and we know it has started to spread to her adrenal glands and liver. In the last few days she has complained of hearing funny noises. She says it sounds like a washing machine in her head, then yesterday she woke up with a searing headache behind her right eye and the right side of her head. Do you think this could be the start of a spread to the brain? Does anyone have experience of lung cancer spreading to the brain? Thanks for reading. Claire xx
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