This could be due to blood clot in artery, emboli, narrowing in blood vessel of
brain due to
risks like hypertension, diabetes, atrial fibrillation and high cholesterol. Symptoms are dizziness, altered touch, pain, temperature etc. there may be lack of coordination and balance, muscle weakness of face, arm, leg, numbness or tingling on one side of body etc. Diagnosis is usually based on history. Your clinician may ask for brain MRI, MR angiogram, echo, carotid duplex, and ecg.