- It is obligatory for a woman to take a ritual bath when her menstruation is over.
- It is obligatory for a woman suffering from Istihādah to perform prayer.
- Hayd (menstruation): It refers to the normal blood that is discharged by the uterus through the vagina of an adult woman during known days.
- Istihādah: It refers to the flow of blood from the nearest part of the uterus, not its bottom, outside its normal time.
- The difference between the blood of Hayd and that of Istihādah is that the former is black, thick, and smelly whereas the latter is red, thin, and not smelly.