What are some reasons blood pressure might drop?

A drop in blood pressure may occur when a person shifts position from sitting or lying down to standing, has stood for a long time, or is experiencing shock, states Healthline. Some individuals experience low blood pressure, or hypotension, directly after eating or in conjunction with emotionally upsetting events.

Symptoms of hypotension vary in intensity and include lightheadedness, dizziness, nausea and blurred vision, according to Healthline. Loss of consciousness may occur.

Pregnancy, loss of blood through injury, anaphylactic shock, and impaired circulation from heart attack or faulty heart valves may cause prolonged hypotension requiring medical attention, as noted by Healthline.