We usually think of air pollution as being outdoors, but the air in your house or office could also be polluted. Sometimes a group of people have symptoms that seem to be linked to time spent in a certain building. There may be a specific cause, such as Legionnaire's disease.
Symptoms of early pregnancy can also be similar to symptoms experienced prior to the menstrual period, so a woman may not recognize the symptoms as related to pregnancy. This article describes the most common symptoms of pregnancy in its early and later stages. Medically Reviewed by a Doctor on 12/4/2014.
You might not experience fatigue every single month, but chances are youâve experienced PMS fatigue before. Fatigue is actually one of the first pregnancy symptoms to show up. It can strike about one week after conception â before youâve even missed a period. This early pregnancy symptom is caused by increased levels of progesterone, a hormone that helps support the pregnancy and baby.