Hi there. The various causes of
headaches are tension headaches due to contraction of
muscles in shoulders, neck
, scalp and jaw, related to stress, depression, foods like chocolate, caffeine. These are both sided starting from the back of head spreading forward. Migraines are severe, recurrent headaches, accompanied by other symptoms like visual disturbances or nausea. One side of head, may spread to both associated with an aura.