Finger belly dry with vertical lines may be due to prolonged immersion, malnutrition, chapped eczema and other reasons. 1. Prolonged immersion: when swimming or bathing for a long time, as the fingers are immersed in water for a long time, water from the outside world will enter the skin, the dermal cells will expand, and the extrusion between the cells will make the epidermis bulge upward, leading to the symptoms of vertical lines and wrinkles on the belly of the fingers. 2. Malnutrition: When the human body is in severe malignant disease or tumor terminal stage, due to gastrointestinal dysfunction, protein absorption and intake capacity may be reduced, resulting in severe malnutrition and subcutaneous protein loss, manifested as vertical lines and wrinkles on the abdomen of the fingers. 3. Cracked eczema: due to frequent contact with various detergents and external physical and chemical stimuli, it will further lead to hand dryness and cracked eczema, with cracked, hypertrophied, rough, dry, vertical lines and wrinkles on the fingers. Patients with symptoms of dry finger belly with vertical lines, after excluding physiological causes, should go to the hospital in a timely manner for relevant examinations, clear causes, under the guidance of a professional doctor for the correct treatment.