Liaison office of Grand Ayatullah Sayyid Ali Al Sistani (L.M.H.L) in London, Europe, North and South America.
One of the types of blood that women discharge is the blood of istiḥāḍah. A woman at the time of experiencing istiḥāḍah is called a ‘mustaḥāḍah’.
Ruling 390. Most of the time, the blood of istiḥāḍah is yellow in colour, cold, comes out without pressure or a burning sensation, and is not thick. However, it is possible, sometimes, for it to be black or red, warm, thick, and to come out with pressure and a burning sensation.
Ruling 391. There are three types of istiḥāḍah: slight (qalīlah), medium (mutawassiṭah), and excessive (kathīrah).
Slight istiḥāḍah is when the blood only stains a piece of cotton [or the top layer of a sanitary pad/another absorbent item] and does not seep into it.
Medium istiḥāḍah is when the blood seeps into a piece of cotton [or top layer of a sanitary pad/another absorbent item] that a woman would normally use to absorb the discharge of blood – albeit into only one side of it – but it does not reach the bottom of it.
Excessive istiḥāḍah is when the blood soaks a piece of cotton [or sanitary pad/another absorbent item] and reaches the bottom of it.