There are several things that invalidate wudu, which is the Islamic ritual of washing parts of the body before prayer. These include:

• Urination, defecation, and flatulence
• Deep sleep
• Loss of senses, fainting, and loss of consciousness
• Menstruation and postpartum bleeding
• Sexual intercourse and ejaculation
• Touching the private parts with bare hands (not according to Hanafi Madhhab)
• Vomiting mouthfuls of water, pus, blood, or food
• Ritual impurities like urine

It is important to note that different schools of thought may have varying opinions on what breaks wudu, and there may be conflicting opinions on certain issues.