The reason for swollen hands and feet in the morning: first, it is possible that that is because of poor rest after staying up late the night before, or after drinking a lot of water the night before, there may be swollen hands and feet the next morning. Secondly, women of childbearing age may experience swelling of the hands and feet during their menstrual period or when they are about to have their period. Third, some patients may have this unexplained idiopathic swelling of the hands and feet. Regarding these pathological factors that cause swelling of the hands and feet: First, kidney disease, poor kidney function or glomerulonephritis can lead to protein leakage, while the glomerular filtration rate decreases and other conditions, which then cause swelling of the hands and feet. Secondly, patients with liver disease often have reduced albumin synthesis, leading to hypoproteinemia and then swelling of the hands and feet. Third, heart disease, if there is cardiac insufficiency, swelling of the hands and feet will occur. Fourth, patients with malnutrition or endocrine diseases such as hypothyroidism may also have swollen hands and feet.