If your ankle is swollen, and you haven't injured it, this may indicate that you are suffering from oedema. Oedema occurs when too much fluid is retained in the areas between the cells in our body.
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According to Footsmart.com, there is a raft of factors that can cause ankle swelling, including taking oral contraceptives or undergoing hormone replacement therapy; abusing diuretics or laxatives; abusing drugs in general; eating too much salt and consuming too many carbohydrates; a history of phlebitis or varicose veins; sodium retention; allergic reactions, trauma to the ankle and neuromuscular disorders.
If you do have oedema, it will result in "pitting," which means that when you press down on the swollen area, an indentation will result and last long after you have quit pressing down.
Of course, any standard sprain, break or bruise to the ankle can cause it to swell. If you have been standing for too long, this may cause your ankles to swell. If you have a sunburn or have been bitten by an insect, expect to swell.
Medications that may cause your ankles to swell, according to Nlm.nih.gov, include blood pressure-lowering drugs, which are called calcium channel blockers (diltiazem, amlodipine, nifedipine, verapamil and felodipine); testosterone and hormone replacement drugs; antidepressants including MAO inhibitors (such as phenelzine and tranylcypromine); tricyclics (nortriptyline, desipramine and amitriptyline) and steroids.
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