Hadith: Umm Habībah had non-menstrual vaginal bleeding for seven years. She asked the Messenger of Allah (may Allah's peace and blessings be upon him) about that, and he ordered her to take a ritual bath.

عن عائشة رضي الله عنها قالت: "إن أم حبيبة اسْتُحِيضَتْ سبع سنين، فسألت رسول الله صلى الله عليه وسلم عن ذلك؟ فأمرها أن تغتسل، قالت: فكانت تغتسل لكل صلاة".
[صحيح] - [متفق عليه]

‘Ā’ishah (may Allah be pleased with her) reported: Umm Habībah had non-menstrual vaginal bleeding for seven years. She asked the Messenger of Allah (may Allah's peace and blessings be upon him) about that, and he ordered her to take a ritual bath. ‘Ā’ishah said: "She used to take a ritual bath for every prayer.”
Sahih/Authentic. - [Al-Bukhari and Muslim]

Explanation

The Prophet (may Allah's peace and blessings be upon him) ordered Umm Habībah to take a ritual bath when she asked him about what she had to do concerning her non-menstrual vaginal bleeding. She, thus, used to do so for every prayer. She remained in this state for seven years. This non-menstrual vaginal bleeding, however, is uncommon among women. The regular blood women discharge is that of menstruation in a number of days monthly. It has signs that women can recognize.