For blood pressure how low is too low?

Depends: On multiple issues. If you are symptomatic....Fatigued, lightheaded etc. If yes then it is too low. Also depends if you are taking medications to lower bp...Then it might be to low. Some people have BP in the 90's and that is normal for them. See your doctor.

Lie down: No BP meds, could take salt.. Plenty of fluids.

Depends: On multiple issues. If you are symptomatic....Fatigued, lightheaded etc. If yes then it is too low. Also depends if you are taking medications to lower bp...Then it might be to low. Some people have BP in the 90's and that is normal for them. See your doctor.

Merits evaluation.: This merits a careful evaluation, starting with taking your blood pressure sitting and standing. A thorough evaluation includes taking your history, a physical exam, certain blood and urine tests and, in some instances, some special tests. The cause is first determined, then therapy can commence.

Blood pressure: Speak with your doctor to see whether your blood pressure is a concern and what to do about it, if the doctor says treatment is needed.