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1792 T. Jefferson Notes 10 Apr. in Papers (1997) XXVII. 824 Recipe for the head-ach called the Sun-pain. 6. grains of Calomel taken at night.

1842 R. Dunglison Med. Lexicon (ed. 3) Hemicrania, pain, confined to one half the head. It is almost always of an intermittent character;—at times, continuing only as long as the sun is above the horizon; and hence sometimes called Sun pain.

1905 C. E. Woodruff Effects Trop. Light vi. 85 One form of the periodic headache called migraine is so often due to excessive light that it was once called sun pain.

1947 V. Randolph Ozark Superstitions vii. 135 What the hillman calls ‘sun pain’ is a terrible headache which lasts all day but doesn't keep the patient awake at night.