A doctor explains what can cause swelling (edema) in both ankles when your heart, liver, kidney and other key tests are normal and you’re not obese.
http://scarysymptoms.com/2013/07/bilateral-ankle-edema-causes-when-tests/
Common causes of ankle swelling include: Traumatic Injury. A traumatic injury, such as an ankle sprain or a broken ankle, is the most common cause of ankle swelling. Patients almost always remember the particular injury, but occasionally even subtle injuries can also lead to ankle swelling.
https://www.verywell.com/causes-of-ankle-swelling-2549379
Cellulitis typically causes swelling of the skin over only part of a limb. Much less often, an infection deep under the skin or in the muscles can cause the whole limb to swell. Blockage of a lymph vessel (lymphedema) is a less common cause.
http://www.merckmanuals.com/home/heart-and-blood-vessel-disorders/symptoms-of-heart-and-blood-vessel-disorders/swelling
“Ankle swelling in general is common, and when painless can be caused by such simple things as gravity, such as when one is on their feet for long time,” says Jacob Teitelbaum, MD (internal medicine), founder of the Fatigue and Fibromyalgia Practitioners Network.
http://scarysymptoms.com/2013/07/bilateral-ankle-edema-causes-when-tests/
These disorders all cause fluid retention, which is the cause of the swelling. Another cause of swelling of the lower legs is pooling of blood in the legs. Many obese, middle-aged or older people normally have a small amount of swelling at the end of the day due to blood pooling.
http://www.merckmanuals.com/home/heart-and-blood-vessel-disorders/symptoms-of-heart-and-blood-vessel-disorders/swelling
Pregnancy is another of the common causes of swollen feet and ankles. There are three reasons for this: a) the excess weight gained puts more pressure on the legs and feet. b) the expanding uterus can place pressure on the blood vessels for the legs and. c) pregnancy hormones cause the body to retain fluids.
http://www.foot-pain-explored.com/swollen-feet-and-ankles.html
The following can cause swelling (edema) in both (bilateral) ankles: heart, liver and kidney failure; low thyroid; celiac disease; kidney stones; PMS; excessive sitting or standing; hot weather; varicose veins; high salt (sodium) intake; old age.
http://scarysymptoms.com/2013/07/bilateral-ankle-edema-causes-when-tests/
a) Heart Problems: Problems such as congestive heart failure and hypertensive heart disease can cause swollen feet and ankles. If heart function decreases, it can’t pump the blood around the body as effectively and pressure builds up in the blood vessels causing fluid to leak into the surrounding tissues.
http://www.foot-pain-explored.com/swollen-feet-and-ankles.html
A blockage in the lymphatic system causes excess lymph fluid to collect in the tissues and can cause swollen feet and ankles. It can be caused by a number of things such as infection, injury or cancer treatment such as radiotherapy or the removal of lymph nodes.
http://www.foot-pain-explored.com/swollen-feet-and-ankles.html
Once the cause of the ankle swelling is determined, effective treatment can be initiated. Ankle swelling causes the accumulation of fluid within the ankle joint or in the soft tissues surrounding the ankle. A traumatic injury, such as an ankle sprain or a broken ankle, is the most common cause of ankle swelling. Patients almost always remember the particular injury, but occasionally even subtle injuries can also lead to ankle swelling. Also, stress fractures can occur around the ankle joint leading to swelling.
https://www.verywell.com/causes-of-ankle-swelling-2549379
can heart cause ankle swelling causes
Heart, liver and kidney failure; low thyroid; celiac disease; kidney stones; PMS; excessive sitting or standing; hot weather; varicose veins; high salt (sodium) intake; old age can cause  ankle swelling.