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Regarding what you mentioned

, as a temporary measure and to relieve the associated pain then you have to use a simple analgesic medication such as ibuprofen.

What are the possible causes of menstrual irregularities ?

• This may be due to fibroid or benign uterine tumor.
• This may be due to endometriosis or the presence of uterine tissues outside the uterus.
• This may be due to bleeding disorders .
• This may be due to side effect of the hormonal pills.
• This may be due to hormonal disturbance such as disorder to the thyroid gland.

What is the exact cause of this case?

Without doing a full clinical evaluation we cannot determine the exact cause of this case .

What should you do in this case ?

You have to visit the gynecologist doctor  so that the doctor could detect the exact cause of the case , then he will treat it accordingly .
  Stay well.   
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