If any of the following happens, the Wudu will invalidate. If you want to pray later or do something else, you will have to take wudu again. These are the things that invalidate and break wudu.
1- Anything coming out of the penis and anus like urine, feces, sperm, madi, blood, etc. Even if the air comes out from the bottom , that invalidate and 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.
3- Blood, pus, yellow liquid, etc flowing from any part of the body... If the blood that comes out of the body does not flow or does not spread, it does not invalidate wudu. The pus and yellow liquid coming out of a wound is regarded the same. That kind of liquid that does not spread around by itself will not invalidate wudu even if it is wiped. Letting blood through cupping and using leeches invalidate wudu.
As for the leakage other than blood, pus and yellow liquid, they will invalidate wudu if they leak due to an illness. For instance, the wudu of a person is invalidated if his eyes are watered due to an illness. The leakage that does not happen due to an illness does not invalidate wudu. For instance, tears that flow due to crying or laughing a lot or running of the nose due to cold weather will not invalidate wudu.
Pure water coming out of the pimples on the body is like blood and invalidates wudu according to a view. According to another view, it does not. The second view is a great ease for those who have scabies and pockmarks. It is reported from Imam Hulwani that there is no objection to acting in accordance with the second view when there is a real necessity. The wetness caused by eczema and the rashes between the fingers do not invalidate wudu.
According to Shafiis, leakage of blood, pus, yellow liquid that does not come from the genital organs and anus does not invalidate wudu.
4-To vomit mouthful. It does not matter whether the thing that is vomited is food, water or bile. If the total amount of what is vomited amounts a mouthful, it invalidates wudu even if it is vomited in small amounts
5- If blood equaling to saliva or more than saliva comes out of the mouth, wudu is invalidated. It can be understood from the color whether blood is equal to, more or less than saliva. If the color is yellow, it means saliva is more. If it is light red, it means they are equal. If it is dark red, it means blood is more. If saliva is more than blood, wudu is not invalidated. If traces of blood are seen when one bites a quince, an apple, etc, wudu is not invalidated.
6- Having a sexual intercourse. 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.
9- When the time for a prayer ends, wudu of an excused person is invalidated.
10-Getting drunk by taking alcohol or drugs invalidates wudu. It is definitely haram to take intoxicating drinks but the amount that does not make a person drunk does not invalidate wudu.