What are warning signs of a cluster headache?
- Although the pain starts suddenly, you may catch a few subtle cues of the oncoming headache on the affected side: Discomfort or a mild burning sensation
- Swollen or drooping eye
- Smaller pupil in the eye
- Eye redness or watering
- Runny or congested nose
- Red, warm face You may begin to sweat a lot, or light may bother you.
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