She definitely needs to go to the Dr. I dated a girl for a while that had a similiar problem. It turns out she had endometriosis. She would have sharp pains immediately following sexual intercourse. Eventually they gave her a shot that was supposed to help. The shot made her not have a period for about a year(what a year it was), and it eased the pain greatly. She eventually had to have surgery to remove some of the scar tissue from her ovaries. Below is a list of symtoms. The sooner she gets it checked out, the better. Here is a useful link w/ more info also.
LinkSymptoms of endometriosis
The most common symptom of endometriosis is pelvic pain. The pain often correlates to the menstrual cycle, however a woman with endometriosis may also experience pain at other times during her monthly cycle.
For many women, but not everyone, the pain of endometriosis can unfortunately be so severe and debilitating that it impacts on her life significant ways.
Pain may be felt:
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before/during/after menstruation
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during ovulation
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in the bowel during menstruation
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when passing urine
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during or after sexual intercourse
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in the lower back region
Other symptoms may include:
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diarrhoea or constipation (in particular in connection with menstruation)
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abdominal bloating (again, in connection with menstruation)
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heavy or irregular bleeding
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fatigue