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 Or Dysmenorrhea. Dysmenorrhea, the medical term for menstrual cramps, affects almost half of women everywhere, causing painful cramping before and during their periods. Some women are even bedridden by their discomfort, often having to miss work or school and cancel other plans.