Windgalls
Such swellings are very common in horses and are usually not a cause for great concern. Windgalls are caused by a little more fluid and pressure forming in the joints than is normal. This can just be caused by concussion or hard work.
Tendinous windgalls: These are swellings of the digital tendon sheath, they represent excess production of the lubricant that allows free running of the tendons around the joint. In their usual position above the fetlock joint they rarely are a problem and usually are not associated with lameness.
On the occasions when they do involve heat and pain they need very thorough investigation and treatment. Swelling of the tendon sheath below the fetlock is different. There is often lameness, and surgery may be required to bring about recovery.
Articular windgalls: These are a swelling of the joint capsule brought about by overproduction of joint fluid. These can be a benign finding particularly in heavy horses with upright pasterns and a support bandage on the joint after exercise will often reduce their size.
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