I have had the extreme misfortune of treating my Achilles injury along the lines proposed by Marijuologist. Thus, I have been allowing inflammation to run its course, as my injury has gotten worse and worse. Finally (after months of suffering), I started icing two days ago, and for the first time I have a sense of hope. Inflammation is a terrible, terrible thing that, left on its own, badly damages your already damaged cells. Ignore this (and listen to the pro-inflammation theory of Marijuologist) at your own risk.
Here is a cut and paste from an article from the Linus Pauling Institute. The first paragraph is background, but pay special attention to the second paragraph:
inflammation can last days, months, and even years. Chronic inflammation is primarily mediated by monocytes and long-lived macrophages; monocytes mature into macrophages once they leave the bloodstream and enter tissues. Macrophages engulf and digest microorganisms, foreign invaders, and senescent cells. Macrophages release several different chemical mediators, including IL-1, TNF-alpha, and prostaglandins, that perpetuate the pro-inflammatory response. At later stages, other cells, including lymphocytes, invade the affected tissues: T lymphocytes kill virus-infected cells and B lymphocytes produce antibodies that specifically target the invading microorganisms for destruction.
Macrophages and other leukocytes release ROS and proteases that destroy the source of inflammation; however, damage to the body's own tissues often results. In fact, tissue damage is a hallmark of chronic inflammation. Another characteristic of chronic inflammation is repair of the damaged tissue by replacement with cells of the same type or with fibrous connective tissue. An important part of the inflammatory process involves local angiogenesis—the development of new blood vessels. In some instances, the body is unable to repair tissue damage, and the inflammatory cascade continues. Chronic inflammation is abnormal and does not benefit the body; in fact, chronic inflammation is involved in a number of disease states (see below).