The general solutions for the harmonic oscillator differential equation fall into four general categories: 1) Undamped: [math]x(t) = Ae^{i\omega t}[/math] This is a free-running sinusoidal oscillation that doesn't change over time.
Key Facts. 1  Itâs normal to have mild cramps during your period. 2  Menstrual cramps often start 1-2 days after your period begins. 3  If your cramps donât get better with over-the-counter medicine, you should see your health care provider.
Menstrual cramps are not the same as PMS. Symptoms of PMS such as bloating, weight gain, and moodiness happen before a womanâs period begins, and get a lot better when her period starts.On the other hand, with dysmenorrhea, cramps usually get worse the first day or two of a womanâs period and have a different cause and treatment.enstrual cramps are caused by uterine contractions (when your uterus tightens and relaxes allowing blood to leave your uterus). The lining of your uterus releases special chemicals called âprostaglandins.â These substances can increase the intensity of the contractions, especially if the levels rise.