Past cycles
If you happen to go through two or three menstrual cycles and know you are not pregnant, this could be a sign of various health problems.
Unexpectedly extremely strong cramps
Unbearable menstrual cramps can be a sign of endeometriosis or of a foreign mass. Make an appointment with the doctor.
Leakage between cycles
While menstrual flow between two cycles can be normal, especially when using contraceptives, a visit to the gynecologist is still not a bad idea. It can also be cysts or infections.
High leakage lasting more than 10 days
If you have these symptoms, you may have a range of problems that can make you anemic.
Unbearable paramenstrual symptoms
If you turn into a real monster before the menstrual cycle, with anthi seizures, nervousness and immediate mood swings, you may need to consume prescription sedatives.
Source: Marie Claire