There are many factors and conditions that can cause swelling in the legs and/or feet, including
Swelling
Edema - Symptoms and causes - Mayo Clinic
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Vascular Problems of the Feet & Legs
Causes of Swollen Legs and Treatment - St Johns Vein Center
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Leg Edema Treatment Austin - Leg Ankle Foot Swelling Therapy
Why Are The Veins In My Feet Bulging?
Understanding swollen legs
Heart failure and swollen feet: Link, treatment, and more
Wondering About the Bulging Veins in Your Feet - We Have the Answers
Edema: Symptoms, Causes, Treatments
Elevating Your Feet to Reduce Swelling