I have moderate joint pain with swollen hands and a headache, what could this be?

See a Doctor: These seemingly disconnected symptoms are probably linked to a generalized or systemic illness going on like a kidney problem or an autoimmune illness like lupus. You need to see a doctor for a complete workup.

Vague: A vague description that requires a thorough history and exam. Could be flu like symptoms, could be allergies, could be reaction to meds or foods, could be a number of causes. Duration is important, severity, location, etc. You should see a doctor asap.