Common causes of headache*
| Primary headache | Secondary headache | ||
|---|---|---|---|
| Type | Prevalence (%) | Type | Prevalence (%) |
| *After data from Rassmussen.22 | |||
| Migraine | 16 | Systemic infection | 63 |
| Tension type | 69 | Head injury | 4 |
| Cluster headache | 0.1 | Subarachnoid haemorrhage | <1 |
| Idiopathic stabbing | 2 | Vascular disorders | 1 |
| Exertional | 1 | Brain tumour | 0.1 |