Failure to concentrate
Blood volume decreases: Blood volume decreases can also lead to decreased blood pressure. A substantial loss of blood from severe internal trauma or dehydration reduces the volume of blood, leading to severe decreases in blood pressure. Pregnancy also causes hypotension.
A number of drugs, including diuretics and other used in hypertension treatment, may cause lower blood pressures; heart medicines, such as beta blockers; Parkinson’s disease medicines, tricyclic antidepressants, erectile dysfunction medicines, especially in combination with nitroglycerine, and drugs and alcohol. Other prescriptions and off the encounter medications in combination with high blood pressure medications may result in low blood pressure. If you are having abnormally low heart rate (bradycardia), heart valve problems, heart attack and heart failure than this all may lead to low blood pressure. Maybe your heart can not circulate blood enough to satisfy the needs of your body.