Why does my head hurt only on one side? Only one side of the headache, mainly seen in the following aspects of the cause: first, migraine, migraine patients in the acute attack of migraine, mainly for one side of the headache, can be one side of the temporal, around the temples or frontal pain, pulsating or throbbing pain; the second, cluster headache, cluster headache in the attack of the headache is also manifested as a side of the headache The second one is cluster headache, cluster headache is also manifested as one-sided headache in the attack, mainly with one side of the periorbital area and frontal area showing persistent pain, and the nature of the pain is very intense; the third one is one-sided headache, such as the patient’s side of the occipital nerve pain, especially when the occipital nerve is involved in the occipital, temporal and top of the head and then radiates to the forehead with tugging, or burning, or electrocution-like pain. Headache on only one side of the head is mainly due to the above three reasons.