Had iv in left arm vein 4 weeks ago. flew to paris from la 3 days ago now vein hurts from inside elbow down to my wrist. what could it be/treatment?

Needs evaluation: This needs to be evaluated by your doctor as soon as possible. Possibilities include inflammation, blood clot, infection, especially if swelling, redness, and/or warmth is noticed. Depending on cause, treatment will vary.

You must: Rule out infection or blood clot.See your doctor for appropriate work up.

Arm vein clot: If you had an iv in this vein and now it hurts you need to rule out a clotted vein or an inflammatory process of the vein. You should see a vein specialist for an upper extremity venous ultrasound.