Swelling in the legs, along with morning nausea, can have several causes. If you are pregnant, both symptoms are quite common due to hormonal changes and fluid retention. In non-pregnant individuals, this combination may be due to dehydration, low blood pressure, digestive issues, or side effects of certain medicines. Swelling in the legs can also occur from prolonged standing, excess salt intake, or, less commonly, conditions affecting the kidneys, heart, or liver. To manage mild symptoms, stay well hydrated, reduce salt intake, and elevate your legs when resting. However, if the swelling is persistent, severe, or associated with symptoms like breathlessness, reduced urine, high blood pressure, or severe vomiting, it is important to consult a doctor for proper evaluation and tests to identify the exact cause.