In the late 19th century (beginning about 1858 with the construction of prototypes by the British and French navies), the armoured frigate was a type of ironclad warship that for a time was the most powerful type of vessel afloat.
Try the following home treatment to help manage your menstrual cramps: 1  Use heat, such as hot water bottles, heating pads, or hot baths, to relax tense muscles and relieve cramping. 2  Drink herbal teas, such as chamomile, mint, raspberry, and blackberry, which may help soothe tense muscles and anxious moods. 3  Exercise.
By Mayo Clinic Staff. During your menstrual period, your uterus contracts to help expel its lining. Hormone-like substances (prostaglandins) involved in pain and inflammation trigger the uterine muscle contractions. Higher levels of prostaglandins are associated with more-severe menstrual cramps. Severe contractions may constrict the blood vessels feeding the uterus. The resulting pain can be compared to the chest pain that occurs when blocked blood vessels starve portions of the heart of food and oxygen. Menstrual cramps may also be caused by: Endometriosis.