@rachelle Hello, No dehydration doesn’t cause swelling in the fingers. swollen fingers; rather, excess fluid intake can potentially lead to swelling. Drinking excessive amounts of water, perhaps during a tedious exercise can cause hyponatremia, and hyponatremia can result in swollen fingers. When the body holds onto excess water, it can lead to swollen tissues in the extremities, especially in the fingers. Symptoms include bloating and puffiness.