Changes in estrogen levels are also thought to play a role.

But some women continue to have symptoms for years, perhaps because their estrogen levels are particularly low.

But some women continue with symptoms for years, perhaps because their estrogen levels are lower than average.

My first blood test yields an estrogen level of 203.

On day 8, my estrogen level is 370 - a good rise again.

Some members of the stretch group lost weight, but their estrogen levels did not drop.

During the rest of the month, estrogen levels climb and fall gradually.

Soy seems to also affect estrogen levels in the body.

They also had higher estrogen levels - a finding that has not been seen in many earlier studies, Brand says.