Muscles in the Human Body. Muscles are how we move and live. All movement in the body is controlled by muscles. Some muscles work without us thinking, like our heart beating, while other muscles are controlled by our thoughts and allow us to do stuff and move around.
Cramping and Breast Tenderness. Cramping is one of the most common symptoms a woman experiences before, during or after her menstrual cycle. Caffeine contributes to cramps because of its diuretic nature--it increases urine production and promotes dehydration. In addition, coffee contains oils that may inflame your intestines and cause cramping.
Caffeine is a stimulant that has been known to cause early periods in some women, according to the website Women to Women. Large amounts of coffee, soda, chocolate or tea can throw off a woman's menstrual cycle by altering her hormone levels. Too much caffeine increases the amount of estrogen a woman produces, and excess estrogen can cause a woman to menstruate early. In addition, caffeine may cause a woman to feel irritable and nervous, thus upsetting her natural hormonal balance and resulting in an irregular period.