About Hypotension: Low blood pressure can be broadly defined as any blood pressure that is below the normal expected for an individual in a given environment. Low blood pressure, therefore, is a relative term. Blood pressure varies greatly with activity, age, medications, and underlying medical conditions.
Conditions not associated with the neurological system may cause low blood pressure. Anything that causes a loss of fluids, including dehydration from diarrhea, vomiting, or bleeding may cause low blood pressure. Adrenal gland dysfunction, pregnancy, and blood loss may lower blood pressure as well. Medications May Cause of Low Blood Pressure.
Sepsis is a life-threatening condition in which the body is fighting a severe infection that has spread via the bloodstream. If a patient becomes "septic," they will likely have low blood pressure leading to poor circulation and lack of blood perfusion of vital tissues and organs.
Other dehydration causes include: Diarrhea, vomiting. Severe, acute diarrhea — that is, diarrhea that comes on suddenly and violently — can cause a tremendous loss of water and electrolytes in a short amount of time. If you have vomiting along with diarrhea, you lose even more fluids and minerals. Fever.