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.
Why Do I Get Painful Cramps During My Period, What To Do When You Have Really Bad Cramps. Dealing with cramping in the abdominal area, upper thighs, and severe lower back pain is a serious concern for many women prior to, during and occasionally after their menstrual cycle.