Hi! Good evening. I am Dr Shareef, a general surgeon answering your query. Stomach tumour per se won t result in a paralysis, but some tumours spread by the blood stream and then cells of the tumour might travel in the blood to any part of the body, brain being one. These transferred cells would then start multiplying in the brain resulting in pressure symptoms, and paralysis could result by this pressure. This is also known as pressure on the brain due to a SOL(space occupying lesion) due to the growth of the cells. I hope I answered your question. Please do not hesitate to ask in case of any further doubts. Thanks for choosing health care magic to clear doubts on your health problems. I wish you an early recovery. Dr Shareef.