###Human: Are night sweats and chills symptoms of PMS? ###Assistant: Hello. Chills and night sweats are actually unusual symptoms of PMS (premenstrual syndrome). They have been seen in some women who experience a sudden Progesterone withdrawal as compared to a gradual one, leading to heavier first two days of menses possibly with clots. Some element is contributed by the heaviness of blood flow as well due to sudden decrease in blood volume which gets controlled over next few days. So, the best treatment shall be to keep yourself well hydrated during these days. For further information consult an obstetrician and gynaecologist online -->