Migraine chameleons
| Feature | Onset | Offset | Duration | Quality (usual modality) | Loss of function |
|---|---|---|---|---|---|
| Acute migraine | Gradual | Gradual | 5 min to several hours | Positive (special sensory) | Usually none, or temporary |
| Chronic migraine | Gradual | Ongoing | Ongoing | Positive (special sensory) | Usually none, or temporary |
| Transient ischaemic attacks | Sudden | Sudden | Minutes to 24 h | Negative (loss of function) | Temporary |
| Stroke | Sudden | Ongoing | Long-term | Negative | Permanent, incomplete recovery |
| Epileptic seizures | Sudden | Sudden | 1–120 s | Positive | Nil, occasional temporary (Todd's paresis) |