Haemorrhagic strokes happen when a blood vessel inside the skull bursts and bleeds inside or around the brain.
Possible treatment includes medicine or surgery.
Another co-lead author doctor Lahiru Handunnetthi said: “These neurological complications were very rare, but awareness of these will be important for patient care during mass vaccination programmes across the world.”
Co-author Julia Hippisley-Cox added: “These very rare conditions are very important to spot to ensure that clinicians know what to look for, aid earlier diagnosis, and inform clinical decision-making and resource management.”