Symptoms of low blood pressure include dizziness, blurred vision, nausea, fatigue, and cold, clammy and pale skin, according to Mayo Clinic. Depression, thirst, fainting and rapid, shallow breathing are other symptoms of hypotension.
When blood pressure drops abruptly and is followed by these symptoms, an underlying health issue can be present, adds Mayo Clinic. People who have consistently low readings of their blood pressure and no other problems may not have serious issues, but their doctors may monitor the results of their check-ups closely. A quick and large decrease of blood pressure can result in lightheadedness and fainting. Pregnancy, heart problems, thyroid conditions, severe blood loss, an allergic reaction and severe infection can cause low blood pressure.
Dehydration may cause hypotension, but other problems, such as vomiting, diarrhea and overuse of diuretics, can cause dehydration and lead to low blood pressure, states the American Heart Association. Certain drugs, including beta blockers, tricyclic antidepressants and narcotics can cause low blood pressure.
If low blood pressure occurs with symptoms, doctors usually try to find and treat underlying conditions first, according to Mayo Clinic. Recommendations for increased salt and water in the diet, medications and compression stockings are made for patients whose low blood pressure is unexplained.