<s>[INST] I am trying to help my sister find a diagnosis for her condition that local doctors have been unable to conclude a condition or diagnosis. She is 51 years old. She gets warm tingling sensation in her head and last for only a few minuets, and then it goes away and then she has slurred speech that last for a 15-30 minutes up to 24 hours. She gets 2-4 episodes a day. Doctors have ruled out stroke and MS with testing they have completed. Do you have any suggestions ? [/INST] Hi.tingling sensations in head and episodes of slurred speech can be due to recurrent TIA , vasculitis ,subacute or chronic meningitis .I advise you to do Mri brain and CSF exam.Thanks </s>