2 doctors weighed in:
What can cause a headache on one side and my eye bloodshot in same place?
2 doctors weighed in

Dr. Randolph Evans
Neurology
1 doctor agrees
In brief: Many headaches
There are a number of unilateral headaches associated with cranial autonomic symptoms which can cause redness of the eye on the same side including migraine, cluster, hemicrania continua, paroxysmal hemicrania, and sunct.
Diagnosis depends upon other features of the headache, most importantly duration of the headache without treatment as well as frequency.

In brief: Many headaches
There are a number of unilateral headaches associated with cranial autonomic symptoms which can cause redness of the eye on the same side including migraine, cluster, hemicrania continua, paroxysmal hemicrania, and sunct.
Diagnosis depends upon other features of the headache, most importantly duration of the headache without treatment as well as frequency.
Dr. Randolph Evans
Dr. Randolph Evans
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