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Hello Anon
Thank you for writing!
Are you on medication? That can be a cause.
Other causes can be:

Being overweight
Blood clot in the leg
Increased age
Leg infection
Veins in the legs that cannot properly pump blood back to the heart
https://www.empowher.com/condition/chronic-obstructive-pulmonary-disease (cut and paste)

Anon, it's important to see your doctor about this.
Best,
Susan