By Mayo Clinic staff
Your doctor may try to rule out other causes of swelling in order to arrive at a diagnosis of lymphedema. Swelling can have many causes, including a blood clot or an infection that doesn't involve your lymph nodes.
If you're at risk of lymphedema — for instance, if you've recently had cancer surgery involving your lymph nodes — your doctor may assume you have lymphedema based on your signs and symptoms.
If the cause of your lymphedema isn't as obvious, your doctor may order imaging tests to determine what's causing your signs and symptoms. To get a look at your lymphatic system, your doctor may use an imaging technique, such as:
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