Alcohol can trigger either a migraine or a cluster headache. There are 3 main triggers in alcohol: Dark alcoholic beverages, such as red wine, sherry, brandy, scotch, bourbon, and beer, contain tyramine. Tyramine is an amino acid that occurs naturally in your body and is also found in many foods.
Sometimes a twin pregnancy just happens. In other cases, specific factors are at play. For example, a twin pregnancy is more likely as you get older because hormonal changes can cause more than one egg to be released at a time. Use of assisted reproductive technologies â such as in vitro fertilization â also boosts the odds of twins or other multiples.
Estrogen and Progesterone. Although doctors have conflicting ideas on which hormones cause what, it seems certain that the two hormones that play a major role in pregnancy are estrogen and progesterone. These hormones are responsible for the bulk of pregnancy symptoms experienced by expectant women. 1  Breast soreness and sensitivity, for example, are caused by increasing levels of these hormones and should diminish significantly after the first trimester.