Poor vein walls and valves normally cause varicose veins. There are tiny one-way valves within your veins that open to allow the blood in, and then close to keep it from flowing backward. The walls of the veins are often stretched and lose their elasticity, which allows the valves to weaken.
The resulting twisted blue bulges, referred to as varicose veins, can make your legs feel thick, exhausted, or achy and make you feel self-conscious about their unsightly appearance, but they are not a big threat to your health.
Small lifestyle changes can work well for varicose veins, and walking is a perfect way to make those veins less visible and less painful. Varicose veins are caused by the failure of a vein to pump blood upwards properly through your body.
Most of the time, about 3 to 4 months after the birth of a boy, varicose veins go down. During birth, wearing compression tights and such will help speed up the process while still covering them up.
Regular workout. For your stage of pregnancy, remain within the recommended weight range. Whenever possible, elevate your feet and legs to your heart level or above. When seated, do not cross your legs or ankles. For long periods, don't sit or stand.