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.
Disease: Major health issues, such as cancer or thyroid issues, can cause the bodyâs natural cycle to fluctuate dramatically. Ultimately, this can cause abdominal pain after your period or bad cramps after your period. Implantation: Women that are trying to get pregnant may have had implantation occur. When this occurs, the uterine lining may shed and cause some bleeding that is light and lasts 1 â 2 days at most.