1. Natural Discharges

• Urination: Any release of urine.
• Defecation: Any release of stool.
• Passing Gas: Any release of gas from the rectum.

2. Sexual Activities

• Sexual Intercourse: Any form of sexual intercourse, regardless of whether ejaculation occurs or not.
• Menstrual or Post-Natal Bleeding: Menstruation and bleeding after childbirth also nullify wudu. However, they have specific rulings related to them.

3. Loss of Consciousness

• Sleep: Deep sleep that causes loss of awareness, where one is not aware of their surroundings or cannot maintain control over bodily functions.
• Fainting: Any loss of consciousness, including fainting or similar conditions.

4. Major Impurities

• Touching the Private Parts: There are differing opinions among scholars, but generally, touching one’s private parts with the palm of the hand may require renewing wudu.

5. Vomiting

• Significant Vomiting: Vomiting a large amount is traditionally considered to nullify wudu. Minor nausea or small amounts of vomit may not require renewing wudu.

6. Intoxication

• Intoxication: Any state of intoxication or severe disorientation affecting one’s consciousness.

These are the general guidelines, but specific details might vary depending on the school of thought within Islam (Hanafi, Shafi’i, Maliki, Hanbali). For precise rulings and personal circumstances, consulting a knowledgeable scholar or local religious authority is recommended.