Ladies have varying symptoms for the time of the month.
For some ladies, the monthly cycle is a time of unbearable pain/cramps while for some it's not such a big deal but in recent times while it's totally normal to observe few 'abnormal' signs due to hormonal/body changes at this time, some symptoms shouldn't be totally ignored as these symptoms may sometimes be a sign of an underlying health issue.
Continuous high temperature is a symptom to monitor! Some ladies record a higher than normal temperature during the time of the month but it subsides especially when painkillers are used but when it doesn't and if there's a 'sickly' feeling it's time to see a physician to be sure it's not Pelvic Inflammatory Disease.
2. Terrible/persistent cramps
Severe pains/unbearable menstrual cramps that painkillers won't offer relief to should be investigated as they may be a pointer to serious uterine issues.
3. Excessive bleeding
Heavy menstrual flow occurs in some ladies but in cases where tampons and sanitary towels have to be changed every thirty minutes then there's a problem as this could result in (excessive) blood loss which can cause dizziness or weakness amongst other things as well indicate an underlying health issue.
4. Spotting in-between periods
Spotting in between periods is usually something not to be toyed with. When you're not on any pills and you spot in between periods then it's time for routine check as this could be an abnormalty in the cervix which when left untreated could result in cervical cancer.
5. Irregular Periods
Irregular periods may be caused by excessive stress and other factors but severe delay/irregular cases may be caused by hormonal imbalances and other health issues which shouldn't be ignored.