Estimates for the overall incidence of<unk>  vary between 0.1% and 36%. It is more common in younger patients (especially in the 18–30 age group), females (especially those who are pregnant), and those with a low body mass index (BMI). The low prevalence in elderly patients may be due to a less stretchable<unk> mater. It is also more common with the use of larger diameter needles. A 2006 review reported an incidence of: * 12% if a needle between and is used; * 40% if a needle between and is used; and * 70% if a needle between and is used. On the Birmingham gauge, these correspond to the values 27–24G, 22–20G and 19–16G.<unk>  is roughly twice as common in lumbar<unk>  than spinal anaesthesia, almost certainly due to the atraumatic needles used in spinal anaesthesia.
Post-dural-puncture headache
External compression headache
Acephalgic migraine
Mixed tension migraine
Cold-stimulus headache
Tension headache
Red wine headache
Lupus headache