HOW DO pH INDICATORS WORK? pH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves. weak acids and bases. If an indicator is a weak acid and is coloured and its conjugate base has a different. colour, deprotonation causes a colour change.
Have varicose veins, which are a common cause of superficial thrombophlebitis. Have a pacemaker or have a thin, flexible tube (catheter) in a central vein, for treatment of a medical condition, which may irritate the blood vessel wall and decrease blood flow. Are pregnant or have just given birth.
A hemorrhoid is referred to as thrombus if there is a clot form inside an external hemorrhoid. External hemorrhoid can rupture and cause bleeding. In internal hemorrhoids, symptoms are not noticeable until the hemorrhoids rupture and bleed. The bleeding of internal hemorrhoids is usually minimal. Things that Cause Internal Hemorrhoids to Rupture.