I have read contradictory statements regarding whether nonsteroidal anti-inflammatory drugs (NSAIDs) decrease or increase swelling during the acute phase of a tendon injury.
The use of nonsteroidal anti-inflammatory drugs (NSAIDs) is somewhat controversial. [1, 17] Some physicians argue that the anti-inflammatory effects of NSAIDs are helpful in decreasing swelling, thereby increasing the speed of an individual's recovery. [14, 18, 19] Other authors believe that NSAID use during the acute injury phase may increase swelling by increasing the potential for bleeding via platelet inhibition. 
(all the cited reference are at least 13-year-old)
Do nonsteroidal anti-inflammatory drugs (NSAIDs) decrease or increase swelling during the acute phase of a tendon injury?
I am mostly interested in epicondylitis (epicondylopathy).
- 1 Plancher KD, Halbrecht J, Lourie GM. Medial and lateral epicondylitis in the athlete. Clin Sports Med. 1996 Apr. 15(2):283-305. [Medline].
- 14 Baskurt F, Ozcan A, Algun C. Comparison of effects of phonophoresis and iontophoresis of naproxen in the treatment of lateral epicondylitis. Clin Rehabil. 2003 Feb. 17(1):96-100. [Medline].
- 17 Stanley KL, Weaver JE. Pharmacologic management of pain and inflammation in athletes. Clin Sports Med. 1998 Apr. 17(2):375-92. [Medline].
- 18 Burnham R, Gregg R, Healy P, Steadward R. The effectiveness of topical diclofenac for lateral epicondylitis. Clin J Sport Med. 1998 Apr. 8(2):78-81. [Medline].
- 19 Labelle H, Guibert R. Efficacy of diclofenac in lateral epicondylitis of the elbow also treated with immobilization. The University of Montreal Orthopaedic Research Group. Arch Fam Med. 1997 May-Jun. 6(3):257-62. [Medline].