Headache due to systemic diseases.
D013700:Giant Cell Arteritis / Q000150:complications; D006261:Headache / Q000139:chemically induced / Q000209:etiology*; D006632:Histamine; D006801:Humans; D006973:Hypertension / Q000150:complications; D000860:Hypoxia / Q000150:complications; D007239:Infections / Q000150:complications
D006632:Histamine