High blood pressure during breastfeeding can be caused by overwork, or by medication, or by nephrogenic factors. 1. Excessive exertion: breastfeeding mothers have to take care of their babies, but also irregular breastfeeding, the original rhythm of life is disrupted by the lack of rest, a long time in the state of fatigue, mental tension, lack of sleep leads to increased blood pressure. 2. Drugs: If the pregnant woman has more bleeding during delivery, her blood pressure will drop and she will use antihypertensive drugs, which may increase her sensitivity to drugs and lead to high blood pressure after delivery. 3. Nephrogenic factors: Previously suffered from kidney disease, after pregnancy is stimulated to manifest, breastfeeding will still exist high blood pressure. High blood pressure during breastfeeding should pay attention to rest, try to ensure adequate sleep, control salt intake, if there are symptoms of physical discomfort, you should go to the hospital in time to consult a physician for guidance.