Are hypertension and portal hypertension the same thing?

No: Hypertension is elevated systemic blood pressure, but portal hypertension is when the pressure of the portal vein is elevated. The portal vein is a big vessel that goes from the gastrointestinal tract to the liver, the pressure in this vein can become elevated in cirrhosis( hardening of the liver), in alcoholic liver disease, in hepatitis or from other causes of cirrhosis.

No: No, these entities are quite different. Systemic hypertension, which is usually just referred to as just hypertension, refers to elevations in the standard blood pressure. Portal hypertension actually refers to high blood pressure in the portal vein, which is the vein that connects the gut to the liver. Portal hypertension usually accompanies severe cirrhosis of the liver.