Sneezing and leaking urine in the 4th month of pregnancy is usually a normal physiological phenomenon if it occurs once in a while and there is no other discomfort, but if it occurs frequently and there is frequent, urgent and painful urination, you need to be alert to pathological conditions. I. Physiological phenomenon: sneezing in the 4th month of pregnancy is usually normal if there is no other discomfort. When you sneeze, laugh or cough, the pressure in your abdomen will increase, leading to a brief increase in bladder pressure and thus urine leakage. In addition, some people may be accompanied by bladder muscle relaxation or pelvic floor muscle ligament relaxation, etc., more likely to leak urine, then you can exercise with professional guidance. Pathological factors: 1. Premature rupture of fetal membranes: sneezing and leaking urine is not necessarily premature rupture of fetal membranes, but the symptoms are similar to those of leaking urine, so attention should be paid to differentiation. The premature rupture of fetal membranes is manifested by the sudden flow of a large amount of transparent or yellowish liquid out of the vagina, while individual pregnant women show a small amount of liquid flowing out of the vagina continuously or intermittently. If the pregnant woman has reproductive tract infection, malnutrition, excessive amniotic fluid, etc., she should be more vigilant and consult a doctor in time. 2. urinary system diseases: some urinary system infections can also cause urine leakage, such as urinary tract infection, cystitis, etc. If the pregnant woman has a past or present history, she should pay attention and consult a doctor in time.