IPA: /ɑːrˈθreɪl.dʒə/
KK: /ɑrˈθreɪl.dʒə/
Pain that occurs in one or more joints of the body.
After the long hike, she experienced arthralgia in her knees and ankles.
Arthralgia is formed from "arthro-" (from Greek "arthron", meaning joint) and "-algia" (from Greek "algos", meaning pain). The word describes pain in the joints.
Think of 'arthro-' referring to a 'joint' and '-algia' meaning 'pain' — so arthralgia is the pain in the joints.