Cases in Which Wudu is Broken
1- Whatever comes out from private parts (anus and urinary tract). The following phrase in the sixth verse of al-Ma’idah; “When you come from the toilet….” and the following answer of the Prophet (PBUH) to the question, "what is hadath?": “it is whatever comes out from private parts (anus and urinary tract) show that whatever comes out from private parts like urine, feces, fart, wadi (a thick white secretion discharged after urination), madhi (a white sticky fluid that flows from the sexual organ when thinking about sexual intercourse or foreplay, and so on), sperm and worm break wudu.
2- Loss of consciousness through sleeping, fainting, becoming insane, getting drunk, etc. However, the wudu of a person who sleeps without moving while sitting is not invalidated. (Muslim, Wudu, 2; Ahmad b. Hanbal, 1, 256).
3- blood, pus or yellow liquid coming out from any part of body and spreading around. If the amount of blood that comes from the mouth is equal to or more than saliva, it invalidates wudu.
4- Vomiting a mouthful. For, the Prophet (PBUH) stated “Vomiting breaks wudu” (Tirmidhi, Taharah, 64). If vomiting is not mouthful, wudu is valid.
5- Having a sexual intercourse.
6- In spite of not not having a complete sexual intercourse, physical contact of a man and a woman with thin clothes or without clothes, and their sexual organs touching each other.
7- When one who has made tayammum finds water.
8- Audible laughter during prayer. For, the Prophet stated the following; “When one of you laugh loudly during a prayer, he/she has to renew both the prayer and wudu”. Laughter outside of a prayer does not invalidate wudu.
When one doubts first time whether he/she has washed some of his/her organs or not, he/she should wash those organs again. However, if he/she always doubts, such doubt has no importance. It is regarded as he has completed making wudu. If one who cannot remember certainly whether his/her wudu has been broken or not and remembers that he/she has made wudu, it means his/her wudu is valid. For, something known certainly cannot be eliminated by doubts.
In addition, it is stated by scholars that it is better for a person who doubts whether his/her wudu has been broken or not when he is not praying to renew wudu in terms of taqwa but if he doubts whether his/her wudu has been broken or not while praying, he does not have to leave the prayer to renew wudu.