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Combined oral contraceptive pill may ease painful periods

Washington, Tue, 07 Feb 2012 ANI

Washington, Feb 7 (ANI): Women who use combined oral contraceptive pill suffer less severe pain compared with women who do not use it, a new study has revealed.

 

Although some previous studies and anecdotal evidence have suggested that the combined oral contraceptive pill could have an impact on painful periods, a 2009 review of all the available research by the prestigious Cochrane Collaboration concluded that there was limited evidence for pain improvement.

 

Now, a large Scandinavian study that has been running for 30 years has finally provided convincing evidence that the combined oral contraceptive pill does, indeed, alleviate the symptoms of painful menstrual periods.

 

The new findings by Dr Ingela Lindh and her colleagues at the Institute of Clinical Sciences, Sahlgrenska Academy at Gothenburg University, Sweden, show that women who used the combined oral contraceptive pill suffered less severe pain compared with women who did not use it.

 

Young women often seem to suffer more from painful periods than older women, and the researchers also found that increasing age did alleviate the symptoms, but the effects of pill use and age were independent of each other, with the pill having a greater effect.

 

The researchers questioned three groups of women who reached the age of 19 in 1981, 1991 and 2001. Each group included approximately 400 to 520 women, who provided information on their height, weight, reproductive history, pattern of menstruation and menstrual pain, and contraceptive use.

 

Five years later they were assessed again at the age of 24.

 

By comparing the same women at two different ages, the researchers were able to use each woman as her own control, enabling them to establish whether any reduction in severity of symptoms was due to combined oral contraceptive (COC) use or increasing age.

 

"By comparing women at different ages, it was possible to demonstrate the nfluence of COCs on the occurrence and severity of dysmenorrhoea, at the same time taking into account possible changes due to increasing age," Dr Lindh, who is also a registered nurse and midwife, said.

 

"We found there was a significant difference in the severity of dysmenorrhoea depending on whether or not the women used combined oral contraceptives."

 

Pain and other symptoms were measured by two different scales: VMS (verbal multidimensional scoring system), which grades pain as none, mild, moderate or severe, and also takes into account the effect on daily activity and whether any painkillers were required; and VAS (visual analogue scale), where a woman can grade her degree of pain on a 10 cm line that starts with "no pain at all" and ends with "unbearable pain".

 

"We found that combined oral contraceptive use reduced dysmenorrhoea by 0.3 units, which means that every third woman went one step down on the VMS scale, for instance from severe pain to moderate pain, and which meant that they suffered less pain, improved their working ability and there was a decrease in the need for analgesics," Dr Lindh said.

 

"On the VAS scale there was a reduction in pain of nine millimetres."

 

Independent of the effect of COC use, the researchers found that increasing age reduced the severity of dysmenorrhoea but not as much as COC did; it shifted women down 0.1 units on the VMS scale and five millimetres on the VAS scale.

 

Childbirth also seemed to reduce the severity of symptoms, but this result was limited by the fact that very few women had given birth between the ages of 19 and 24.

 

The researchers also found that in the youngest group (those born in 1982), more women reported suffering from painful periods, and the everity of the symptoms was worse.

 

"We are unsure why this is," said Dr Lindh.

 

"It may be due to changes in the type of oral contraceptive used, for example, differences in oestrogen content and progestogen type, or a different appreciation of pain in the women born in later years, in that they may be more pain sensitive or are more prepared to complain about pain than women of the same age but born earlier," Dr Lindh added.

 

The research is published in Europe's leading reproductive medicine journal Human Reproduction. (ANI)

 


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