title: beta-Endorphin levels lower in arthritis patients.
mesh_terms: D001168:Arthritis / Q000097:blood*; D004723:Endorphins / Q000097:blood / Q000172:deficiency*; D005260:Female; D006801:Humans; D008297:Male; D010146:Pain / Q000209:etiology*; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D001615:beta-Endorphin