Pregnancy rhinitis is defined as nasal congestion that lasts six weeks or longer during pregnancy. Rhinitis affects between 18 and 42 percent of pregnant women. It typically affects women in the first trimester and again in the third trimester. The cause of pregnancy rhinitis is not clear, but changes in hormones may be involved. Many factors can lead to nasal congestion including allergies, infections, and other conditions. In some cases, medications may also cause nasal congestion. During pregnancy, many women experience mood swings, irritability, fatigue, headaches, constipation, nausea, vomiting, dry skin, increased blood pressure, and weight gain. These symptoms are normal during pregnancy. Pregnant women should not use drugs such as aspirin, non-steroidal anti-inflammatory drugs (NSAIDs), and caffeine because they can cause complications in the fetus. Aspirin can also cause hemorrhaging during childbirth. Women who take NSAIDs may need to switch to a drug with less severe side effects for pain relief during labor. Nasal congestion can be very frustrating for both men and women. Fortunately, there are several things you can do to relieve nasal congestion including avoiding substances that cause your nose to run, drinking plenty of fluids, and using over-the-counter medications such as decongestants and saline solutions.