Istihadha

In Islam, the Istihadha (Arabic: اِسْتِحَاضَةٌ; flowing blood) represents a disturbance of the menstrual cycle of the woman which makes it difficult for her to perform some religious rituals (ibadah).

[6] The jurists (fuqaha) said that the case of a woman's menstrual period (istihadha) does not waive the obligatory prayer on her behalf, because this woman is pure and can read and recite the Quran, and since the ruling on istihadha blood is different from the impurity of menstrual blood, it is sufficient for a woman's menstrual period to purify herself of blood that is in excess of her usual monthly habit in order to read the Quran from memorizing it or from the mus'haf or during prayer (salah).

[7] The scholars relied on the permissibility of reading (tilawa) the Quran on the fact that istihadha is a minor invalidating event that requires only the reintroduction of ablution (wudu), so this condition does not nullify the obligation (wajib) of prayer and does not prevent its validity, nor is it forbidden to read (qiraat) the Quran, nor touch the mus'haf, nor enter the prayer hall in the mosque or circumambulate (tawaf) around the Kaaba.

[11][12] If she has a steady habit in her number and time, then she refrains from fasting for the duration of her period only, then she bathes (ghusl), prays and fasts even if there is bleeding on her, because it is menstruation blood that is caused by illness, surgery, stress or falls, so she is not prevented from performing the acts of worship (ibadah) imposed on her, and she is in the same ruling as immaculate women.

[15] In Islam, having sexual intercourse between a husband and his mustahadha wife with blood in her vagina is considered harmful to both spouses.