The heat doesn’t necessarily cause swelling. Swelling can be a result of sodium intake. For example, swelling of the extremities can also be due to cardiovascular disease, kidney disease or liver disease. So, if you have one of these diseases, it's important to follow up with your doctor to make sure the medicines you're taking are correct and that your diet is appropriate.
For example, if a patient with cardiovascular disease has swollen limbs, they need to be mindful that entering a time of year in which we may exercise less or perhaps consume more. Therefore, it may be necessary to adjust his or her medications or diet. This is typically seen during the Christmas holiday season. Watching salt intake is very important, and salt intake increases significantly during that time of year. A lot of the foods that we enjoy during the holidays are very salty, so, balancing the person’s medication, hydration and salt intake can have an important effect. Swollen limbs can also be a result of other diseases. So the heat is not a factor.