During the late pregnancy, the fetus grows and presses on the inferior vena cava, causing obstruction of the return flow, which can lead to vulvar swelling and pain, and if the walking time is too long, the stinging sensation can be significantly aggravated. During this period, you should try to pay attention to bed rest, do not walk for a long time, do not exercise strenuously, if you feel the stinging sensation in the lower body is obvious, you can use warm water bath to relieve pain, you can also use honeysuckle bath, can play a role in anti-inflammatory, swelling. You should try to wear loose cotton underwear to reduce the stimulation of the local skin and reduce the feeling of pain, you should also pay attention to not eat spicy and irritating food, if you eat spicy and irritating food will lead to increased local redness and swelling, which will aggravate the pain.