Itchy belly in the third trimester may be due to allergies, infections, diabetes and other causes, depending on the cause, the treatment varies: 1, itchy rash during pregnancy: due to changes in the body hormone levels during pregnancy, their own immune function is also different from that before pregnancy, pregnant women’s skin is more sensitive, may appear itchy rash during pregnancy. Pregnant women should not use medication without permission, and should be treated symptomatically under the guidance of a doctor; 2. Gestational diabetes: if the blood sugar rises during pregnancy and stimulates the peripheral nerves, pregnant women may also have itchy belly, and should seek medical attention in time to control the blood sugar level in their bodies; 3. Infection: if a pregnant woman’s belly is infected with a fungus, she may develop ringworm, and the itchy belly is more serious and can be accompanied by redness, swelling, pain, and flaking, and should promptly go to the dermatology department for antifungal treatment; 4. Hives: if the pregnant woman is exposed to allergy-prone food or items during pregnancy, resulting in hives, she may also have itchy belly, and should immediately stay away from allergy-causing substances. In addition to the above treatments, pregnant women should try to wear cotton clothing, keep their skin hygienically clean, and eat less spicy and irritating foods, as well as foods that can cause allergies.