Your heart may not be able to circulate enough blood to meet your body’s needs.
Heart problems: Among the heart conditions that can lead to low blood pressure are an abnormally low heart rate ( bradycardia), problems with heart valves, heart attack and heart failure. Other prescription and over-the-counter drugs may cause low blood pressure when taken in combination with high blood pressure medications. Certain medications: A number of drugs can cause low blood pressure, including diuretics and other drugs that treat hypertension heart medications such as beta blockers drugs for Parkinson’s disease tricyclic antidepressants erectile dysfunction drugs, particularly in combination with nitroglycerine narcotics and alcohol. A significant loss of blood from major trauma, dehydration or severe internal bleeding reduces blood volume, leading to a severe drop in blood pressure. Decreases in blood volume: A decrease in blood volume can also cause blood pressure to drop. Pregnancy: During the first 24 weeks of pregnancy, it’s common for blood pressure to drop. Even mild dehydration (a loss of as little as 1 percent to 2 percent of body weight) can cause weakness, dizziness and fatigue. Fever, vomiting, severe diarrhea, overuse of diuretics and strenuous exercise can all lead to dehydration, a potentially serious condition in which your body loses more water than you take in. However, dehydration does not always cause low blood pressure. Dehydration can sometimes cause blood pressure to drop. Most doctors will only consider chronically low blood pressure as dangerous if it causes noticeable signs and symptoms, such as: There is also no specific number at which day-to-day blood pressure is considered too low, as long as none of the symptoms of trouble are present. Within certain limits, the lower your blood pressure reading is, the better. National Hypertension Control Initiative. Pets and Your Health / Healthy Bond for Life. 
A similar charge of redundancy is made against the reason why, which is also a well-established idiom: The reason why the bill failed to pass was the defection of three key senators. … Although the objections described here are frequently raised, reason is because is still common in almost all levels of speech and occurs often in edited writing as well. Critics would substitute that for because in the offending construction: The reason for the long delays in completing the project was that the costs. A second objection is based on the claim that because can introduce only adverbial clauses and that reason is requires completion by a noun clause.
One objection to this construction is based on its redundancy: the word because (literally, by cause ) contains within it the meaning of reason thus saying the reason is because is like saying “The cause is by cause,” which would never be said.
The construction reason is because is criticized in a number of usage guides: The reason for the long delays was because the costs greatly exceeded the original estimates.
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