What Causes Low Blood Pressure?

Low blood pressure, also known as hypotension, occurs when the force of blood flowing through the arteries is lower than normal. Blood pressure is measured using two readings: systolic pressure (when the heart beats and pumps blood) and diastolic pressure (when the heart rests between beats). While a normal reading is generally around 120/80 mmHg, values near or below 90/60 mmHg may be considered low depending on symptoms and overall health.

In many cases, low blood pressure is not harmful and may not require treatment if it does not cause symptoms. However, when blood flow becomes insufficient to reach vital organs like the brain, it can lead to dizziness, fatigue, or fainting. Understanding both the numbers and associated symptoms is essential for proper evaluation.

Signs and symptoms of low blood pressure can vary from mild to severe. Common symptoms include dizziness, lightheadedness, blurred vision, fatigue, nausea, and difficulty concentrating. Some individuals may also experience fainting, weakness, or a cold, clammy sensation in the skin, especially when standing up quickly or after prolonged rest.

In more severe cases, low blood pressure may lead to rapid breathing, confusion, or lack of focus due to reduced oxygen delivery to the brain. These symptoms may come and go or worsen depending on hydration status, activity level, or underlying health conditions, making medical evaluation important when symptoms persist.

Low blood pressure can develop due to reduced blood volume, weakened heart function, or widened blood vessels. Common causes include dehydration, prolonged bed rest, pregnancy (especially in early stages), and blood loss from injury or internal conditions. Certain medications and drugs for Parkinson’s disease may also lower blood pressure.

Other causes include heart conditions like heart failure, valve disorders, or slow heart rate, which reduce the heart’s ability to circulate blood effectively. Endocrine disorders, severe allergic reactions, vitamin B12 or folate deficiency, and prolonged standing can also contribute to hypotension in some individuals.

Treatment for low blood pressure depends on its underlying cause and severity. In many cases, lifestyle modifications are recommended, including increasing fluid intake to improve blood volume, adjusting salt intake under medical guidance, and avoiding alcohol, which can worsen dehydration. Compression stockings may also help improve circulation and reduce symptoms.

If medications are contributing to low blood pressure, a healthcare provider may adjust the dose or change the prescription. Treating underlying conditions such as heart disease, hormonal imbalances, or nutritional deficiencies is also important. In most cases, a combination of lifestyle changes and medical management helps restore stable blood pressure levels.

Medical attention should be sought if low blood pressure is accompanied by symptoms such as frequent dizziness, fainting, blurred vision, nausea, confusion, or shortness of breath. Even if readings are occasionally low, persistent symptoms should not be ignored, as they may indicate an underlying health issue.

At Cardiovascular Medical Associates, Board-Certified Cardiologist Kaushal Tamboli, MD, FACC and the cardiology team perform thorough cardiovascular evaluations to identify the root cause of hypotension. Using diagnostic tools such as blood pressure monitoring, EKG, and laboratory testing, they help determine whether heart-related issues are contributing and guide appropriate treatment for long-term health.

Common causes of low blood pressure (hypotension) include conditions that reduce blood volume, weaken heart function, or cause blood vessels to widen excessively. Dehydration is one of the most frequent causes, as it decreases overall blood volume and limits circulation. Other contributors include prolonged bed rest, pregnancy, and significant blood loss due to injury or internal conditions. Certain medications and drugs used for Parkinson’s disease or heart conditions may also lower blood pressure.

In some cases, low blood pressure may be linked to underlying cardiovascular or systemic issues such as heart failure, valve disorders, or slow heart rate, which reduce the heart’s ability to pump blood effectively. Endocrine disorders, nutritional deficiencies like low vitamin B12 or folate, severe allergic reactions, and prolonged standing can also contribute. At Cardiovascular Medical Associates, Board-Certified Cardiologist Kaushal Tamboli, MD, FACC, and the cardiology team evaluate these causes to identify the underlying reason for hypotension and guide appropriate care. For more information, contact us or book an appointment online. We are conveniently located at 8317 Davis St, Downey, CA 90241. We serve patients from Downey CA, Norwalk CA, Lynwood CA, Cerritos CA, Lakewood CA, Whittier CA, and surrounding areas.